Why 'Apply Resolutions Settings' also perform 'Confirm Video Mode'???

To extend and be more precise - Why ‘Apply Resolutions Settings’ also perform ‘Confirm Video Mode’ in Standalone Game or Shipped Game??

For the last days i was setting up Screen Menu Settings, resolutions, Fullscreen Modes etc, everything worked impeccably for days while i was in PIE. But today after all seemed to be working as intended and completed - i tried it in Shipped Game, and for some reason, plenty of stuff regarding Resolution & Fullscreen Mode works incorrectly.

In my case, simple “Set Resolution” function not just set’s, but also confirms resolution:

It is like it happening during ‘Apply Resolutions Settings’…

Found information, that UE can’t save anything in User Settings while in Standalone Play from Editor.
Closed.