OTG physical mouse doesn't work on right side of screen in landscape mode for many apps

I have an **Oppo A18**. When I am using a physical mouse through OTG, I can't scroll or select when the cursor is on the right side of the screen in browsers and various apps/games. I have seen the same issue posted in Android app/game-specific threads by people with different make/model phones. In native Android apps, I am able to use the full screen. But it's clear there is some compatibility issue with apps made for Android being able to use OTG properly. It's not exactly 50% of the screen, which makes me think OTG input is not quite recognising that the phone is in landscape mode and only using the width available in portrait mode, but on the left side only. I am unable to scroll on the right side of the screen using OTG in landscape mode in any situation where I should be able to and I am unable to click on the right side of the screen when connected to a local server in AVNC and RealVNC. I was unable to click the right side of the screen in both Minecraft and Roller Coaster Tycoon Classic but now these both appear to be working. I tried a handful of random games when I got this phone that had the same issue but cant remember what games they were. Two notable free apps this can be tested on include Opera (v88.3.4661.83672) and Chrome (v135.0.7049.100). To be clear, the cursor can go on the right side of the screen, but I can't left/right-click or scroll. Hovering over something registers and displays hover text. Has anyone known of a fix?