The SVN option is available only when you close the workspace, right click on workspace and select Connect to Source Control… in the System Tree (I guess that’s the menu item name but you can’t miss it).
This is confusing that it is available only when the workspace is closed and only in the System Tree. Appeon should add the items in Properties dialog consistently and also sync menu options in the Library painter which is neglected completely (they removed source control features from the Library painter!).
System Tree results in excessive scrolling and clicking, chews up horizontal screen space globally in the IDE and no way to sort objects. Library painter is more dev friendly with master libraries on the left and detail objects on the right with minimal scrolling, ability to set root, sort, see dates, comments, etc.
Please show some LOVE to the Library painter Appeon and do not abandon it. Add source control menu items and statuses in the Library painter. These should be trivial tasks to copy/paste features from the System Tree. There are many devs who love the Library painter.
Also add the same source control features to objects in the Browser.