Greetings. There are suggestions to improve the usability.
I suggest adding "information" about the monitor and on-the-fly resolution selection functionality. In the case of multiple monitors, the information will allow the user to navigate through the selection of the desired video output. The "calculation panel" will save the user from the agony of calculating the proportions of the screen. The "try resolution" button should allow the user to try on the monitor resolution without making changes to the system, thereby increasing the security of using the application. Look at example.

Greetings. There are suggestions to improve the usability.
I suggest adding "information" about the monitor and on-the-fly resolution selection functionality. In the case of multiple monitors, the information will allow the user to navigate through the selection of the desired video output. The "calculation panel" will save the user from the agony of calculating the proportions of the screen. The "try resolution" button should allow the user to try on the monitor resolution without making changes to the system, thereby increasing the security of using the application. Look at example.