They redesigned the interface a bit and not everything is polished yet. If it breaks/complicates useful workflows, Iād check on the bug tracker if someone reported it, and then create a new one:
On Windows it is in the context-menu alias right-click menu. Which makes absolutely sense because in the ānormalā, left-click menu only actions users use a lot more often are placed, like adding accounts and closing the app. Then again, closing the app is kind of pausing the syncing, so there you go. 