Grid Alignment

[D&D5e]

I'm trying to get a grid aligned in foundry to a map that has a grid already. I know in the past there were some handy keyboard shortcuts to iteratively change map dimensions to fit to a grid, but I can't seem to remember/find them. Everything I can find online is just 2-5 year old suggestions of modules that are out of date or don't really make the process any easier than doing it by hand. It's wild that this takes longer than prepping the rest of my session some weeks just to align a grid.

Does anyone know of any good tricks, keyboard shortcuts, or modules that make this process easier?