it shouldn't it would cause huge problems where accidentialy you would move it out of the scope.. and usually to fix such issiue u just restart blender etc... Floating windows allways should go to defult position after restart of app

The File Browser remembers the size. It does not remember the position.

Regarding Preferences size and position those parameters can be remembered when saved but not when closed. Reopening the file restores the files in their last positions. Why the position and size is not saved after closing? Looks like a bug to me.

In T71935#818261, @Maciej Jutrzenka (Kramon) wrote:

it shouldn't it would cause huge problems where accidentialy you would move it out of the scope.. and usually to fix such issiue u just restart blender etc... Floating windows allways should go to defult position after restart of app

I don't agree. Many Adobe apps have the possibility to save window position and it never caused any issues. There is always option to restore the layout if something is messed up.

In T71935#818306, @Julian Eisel (Severin) wrote:

Storing such information would mean we'd have to ensure it works in all kinds of cases - when opened with different monitor setups, different DPIs, different OSes, etc. Versioning may also become problematic: If we change the layout of the window contents, we may have to add extra versioning code to make sure old sizes/positions are updated correctly.
And yes, storing such things may also cause some issues in practice, as @Maciej Jutrzenka (Kramon) mentioned. We don't have an option to restore the default layout yet (although I'd love to have this).
Note that I'm not totally against this - it's just that this would need quite some effort to work reliably, and we have other priorities.
Also related: D4339.

In some cases it's just better to have something simple and predictable, rather than something that tries to be smart and just causes different problems.

Either way, everything works as designed here. If you disagree about the design, that's fine but not something we can deal with on our bug tracker. We have to keep some strict policies here unfortunately.
So thanks for the report, but I don't see a bug here.

As I written earlier it works when the file is saved and windows are not closed. Reopening the file keeps the windows in last position and size. Why can't that be saved as defaults? Please give people a choice. Opening Preferences and resizing them every time it is opened is quite annoying.

When writing project .blend files, the Blender window-manager is written to it, and with it it's window properties. When reading the file, the window-manager does some trickery to restore things as much as possible, without glitches (e.g. closing all windows to open the new set of windows).
Now if we wanted to store data on individual temporary windows as part of the preferences (which is where you'd want to store this), we'd have to implement this quite differently, since we don't store the window-manager then, only the preferences data.

I've actually worked on a more generic approach to store UI data like this in the preferences when working on the file browser memory (which also stores display type, filters, sorting, etc), but it turned out to be quite complicated. It would definitely require some days of work. This is added to the work to make sure this works on different monitor setups, DPIs, OSes, ...

Again, it's not that I'm not totally against this, it's just nothing simple to get to work, and we have other priorities.

So what about a simple setting to set the preferences window a fixed size defined by a user? Why can't it be bigger? I guess no one uses 800x600 pixels display anymore.

The size was decided on by the UI team because it seemed best for the new layout.
It's not something we should add a setting for, we're wary of adding more settings and generally try to avoid it.

This script below does what I want. Maybe it will help other users too.

import bpy

# Modify scene settings
render = bpy.context.scene.render
render.resolution_x = 900
render.resolution_y = 800
render.resolution_percentage = 100
render.display_mode = "WINDOW"

# Call image editor window
bpy.ops.render.view_show("INVOKE_DEFAULT")

# Change area type
area = bpy.context.window_manager.windows[-1].screen.areas[0]
area.type = "PREFERENCES"

Ive hit a situation where the save image browser defaults to the size of the rendered image render window being saved, but this is really inconvenient in the case of portrait aspect renders. Each time I need to stretch the file browser or close settings etc. to read the filenames. Perhaps that's not the best choice for sizing the browser.

I wish there was an option as well, to let the user CHOOSE to set a size /save the position if they want in the settings... Not default, but let the user choose to do so.

I've had Apps/UIs get stuck offscreen sure.... but you can easily get it back on Windows/PC. Just hit a hotkey and move/snap it over. Not sure about Linux/Mac though.
I could try using the script posted above though. But it's very annoying that the Prefs/Addon window constantly resizes/positions every time I close it, as others said.

The stubbornness of developers in this matter still amazes me.

This drives me nuts. I use a graphics tablet. Every time I go to open a file, like an image texture or whatever, i have to put down the pen and grab the mouse because the File window opens on a different monitor. So. Annoying.

In T71935#818493, @pan beep (beep) wrote:

This script below does what I want. Maybe it will help other users too.

import bpy

# Modify scene settings
render = bpy.context.scene.render
render.resolution_x = 900
render.resolution_y = 800
render.resolution_percentage = 100
render.display_mode = "WINDOW"

# Call image editor window
bpy.ops.render.view_show("INVOKE_DEFAULT")

# Change area type
area = bpy.context.window_manager.windows[-1].screen.areas[0]
area.type = "PREFERENCES"

Thats quite clever. One thing i would change is store these settings before you call it. Then restore those setting after the call for preferences. Other wise you would need to adjust you render X an Y back to your working size.
I made an addon for this, perhaps a bit over the top. But i dont need to resize it all the time now. Ill send you a link.

Small preview

Also because i restore all values right after the window is called, none of the settings which affects the render window is touched. It could be quite annoying if you need to redo your render output dimension all the time. Also this plain script would have been added to the default in order to have it always available, but older projects would still miss it. Thats why i though a simple addon is more conevnient :)

For those interested, you can find it here. I added width and height. The panel is a different vs the normal one, we dont see the hamburger menu in the bottom left. You can still save it from the "Preferences" button you see at the bottom

PS the current version also does height, i found that could be more convenient as well.
The above video does not show that

https://github.com/schroef/Custom-Preferences-Size

In T71935#1144171, @Rombout Versluijs (rombout) wrote:

Also because i restore all values right after the window is called, none of the settings which affects the render window is touched. It could be quite annoying if you need to redo your render output dimension all the time. Also this plain script would have been added to the default in order to have it always available, but older projects would still miss it. Thats why i though a simple addon is more conevnient :)

For those interested, you can find it here. I added width and height. The panel is a different vs the normal one, we dont see the hamburger menu in the bottom left. You can still save it from the "Preferences" button you see at the bottom

PS the current version also does height, i found that could be more convenient as well.
The above video does not show that

https://github.com/schroef/Custom-Preferences-Size

Great! Thank you for this! I wonder why it is not in regular build?