Try this:

In T76227#1008017, @Alaska (Alaska) wrote:

For those experiencing issues with some operators not showing up in the search operator, try these steps:

1. From the top of Blender select Edit -> Preferences.
2. From the list of tabs on the right, select Interface.
3. Now enable the option Developer Extras.
4. Save your preferences. Now you should be able to find the command you're looking for in the search operator.

This is just a temporary fix. As this task explains, almost everything in Blender should be updated so they're accessable in the search operator without adjusting settings. But until then, this is a work around.

But generally speaking, this is a duplicate of T76227: Make All Operators Accessible from Menus, will merge these reports.