Fixing Sims 2 Resolution

Too Long; Didn't Watch.
Manual Installation:
Seek out your sims 2 installation file in your program files. Open up TSData, Res, Config then open up 'Graphic Rules' using a Notepad/Wordpad.
Ultimate Collection on Origin:
Seek out your installation file, likely under Program Files/Origin Games/Sims 2 Ultimate Collection. Then go into 'Fun with Pets'/SP9/TSdata/Res/Config and the graphic rules file.
Find the Resolution settings by searching with Ctrl+F. Words like ScreenModeResolution (or just Screenmode) will help find it. And edit all 4 settings (Low, Medium n High) resolution numbers to the size of your monitor.
Simple as!