Thank you for trying all the steps and sharing the update.
Since Focus Assist and Task Scheduler didn’t seem to identify or reduce the interruptions, let’s try a few more refined steps.
First Press Ctrl + Shift + Esc to open Task Manager.
Find Windows Explorer, right-click it, and choose End task.
Then click File > Run new task, type explorer.exe, and press Enter.
Now, try launching your game and test if the flickering still occurs. This helps determine if the issue is tied to your current Explorer session.
If fails then Go to Settings > Accounts > Family & other users > Add account.
Create a local user account with administrative rights.
Log into that account, install one of your games, and test if the flicker still happens. This can help confirm if the issue is tied to your main profile's settings or something more system-wide.
Go to Settings > Gaming > Game Mode and ensure Game Mode is on.
Then, go to Settings > System > Display > Graphics.
Add your games manually and set them to “High performance.”
This can prioritize your game over background processes during resource contention.
Please get back to me with the result after try these steps.
Regards
Udit