Help with full screen 1440x900

I have a 1440x900 monitor and it is impossible for me to put the full screen, basically “borderless”, “windowed mode” and “full screen” are exactly the same, the ALT + Enter function does not work either, I have checked all the configurations of my pc and everything is in order, I play many other games and only with lost ark I have this error, could someone help me?
I’ll post a screenshot to be more exact.

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had this bug 2 or 3 days after the release. i had to reinstall the game. or delete configuration file if you want to try

I just reinstalled everything, I made sure to delete all settings and game files for a clean download and install on the system, but still the same error :frowning: