Hi @rtemplen,
Are you choosing “sync to odrive”. If so, this is a Premium feature. It allows you to create sync relationships with folders outside of the default odrive folder.
With the free version you can still sync everything down from within the default odrive folder, which should be in your user home folder, unless you moved it. Sync Your odrive
From inside the odrive folder, navigate to the folder you want to sync and right-click on it. There should be several options with odrive icons next to them. You will want the “Sync” option.
For more information on the differences in sync features for free and paid, take a look at this post here: