Planning out a base is very important but it is also ugly and distracting when you aren't actively working on a project. I like to do huge base plans even though I won't get to half of it for years and I don't need to see my plans 24/7, just at specific times when I am building.
Just like you can turn zone visibility on and off, why not add a toggle in the lower right that lets you hide your plans for when you're not actively building/expanding?
Developers don't read the Ideas forum anymore, but check out these mods.
More Planning https://steamcommunity.com/sharedfiles/filedetails/?id=2551225702 (https://steamcommunity.com/sharedfiles/filedetails/?id=2551225702)
Designator Shapes https://steamcommunity.com/sharedfiles/filedetails/?id=1235181370 (https://steamcommunity.com/sharedfiles/filedetails/?id=1235181370)