It would be awesome to be able to rename the “Main Space”. That would give more freedom in structuring a project as one needs or likes. When a projects content is separated into such sections, then each of these sections should have a distinct and easy to understand label. “Main Space” on the other hand is not easy to understand as it says only little about the actual content living there.
Also it would be nice, if the spaces sidebar would disappear when only one space is present.
Great work and keep going,
David