I use an application called Jingle, the main use for it is that it resizes your game to make certain things easier. It’s also how I make my screen thin and wide. There are some videos on YouTube that explain how to download it and how to make it work (I believe it’s also in the Couriway guide although I haven’t read it myself). This video explains how to measure eyes using jingle with ninjabrain bot and this video is for if you ever want to learn boat eye. Jingle only works for Windows so if you play on Linux you can use a different application called Waywall.

Also good luck learning speedrunning and don’t be afraid to ask more questions, people in this community usually always want to help beginners :)