Search this view capability which was added in the product with 2020 Release Wave 1, searches on the fields specified in quick find view, but takes into consideration the selected view definition, when performing the search.

This is enabled by default.

Here Search this view will perform the search within the selected view i.e. All Contacts in this case.

The results show 3 records found within the All Contacts view, for the search term “alex”

The same search term returns blank in the case of Inactive contacts is selected.

The same applies to the sub-grids

To turn off this, select Yes for Use quick find view of an entity for searching on grid and sub-grids from General tab of System Settings

After applying the above change, we can see the text renamed to Quick Find within the Search Box.

Searching now, irrespective of the view selected, will perform the…

Was going through the Model-Driven Apps documentation and found the below article

https://docs.microsoft.com/en-us/powerapps/user/access-checker

It talks about a Check access button on the command bar of a record which will list down all the rights/access/privileges on that particular record.

And also how the user has got those accesses, through security roles directly assigned or through the team the user belongs.

We can also check the access of the other users as well through user lookup.

More on Access in Dynamics 365

Hope it helps..