You are seeing two new behaviors in Windows 11 File Explorer: the default Home start page with recents, and a navigation pane setting that auto-expands and shifts focus. The quickest way to make File Explorer predictable again is to reset its behavior and set stable defaults.
Open File Explorer, select the three dots on the toolbar, then choose Options. In the General tab set Open File Explorer to to This PC. In Privacy uncheck Show recently used files in Home and Show frequently used folders in Home, then select **Clear`. In Browse folders keep Open each folder in the same window. Select Apply.
Still in Folder Options select the View tab, then select Navigation pane. Turn off Expand to open folder and keep Show all folders off. Select Apply and OK.
For side-by-side comparisons, open one of your folders, switch to Details view from the View menu, right click a blank area in the file list, set Group by to
None, and sort byNameif you prefer stable ordering. Go back to the three dots > Options, open the View tab, then select Apply to Folders so that the same view is used across similar folders.
Restart Explorer to lock the changes in. Press Ctrl+Shift+Esc to open Task Manager, select Windows Explorer, then choose Restart.
After these changes File Explorer will open to This PC instead of Home, it will stop jumping focus to unrelated folders, and your folders will keep a simple, consistent layout that makes USB vs folder comparisons straightforward. If anything still jumps after this, tell me exactly which action triggers it and I will tailor the next step.