Where is sync setup for Drive

My Drive is syncing now on my iMac but I run into another problem. No enough HD space. I have to reduce number of folders that are being synced with NAS. Where do I determine what is to be synced?
I got used to Dropbox where in settings it is easy to select which folders are to be synced and omit the rest. I don’t know how to do the same on Drive/NAS.