Good morning all,
I have exactly the same problem.
I'm regularly blocked in view mode, I don't know what manipulation I do to find myself there but I don't know how to get out of it. Whatever tool I select, only the hand is on the cursor, like @b.b.baldur and I cannot select anything on my drawing.
I have to close Designer down and relaunch (thank you @CLC) but the problem starts again after some manipulation in keyboard shortcuts (I'm an Adobe Illustrator expert and try to change to Affinity Designer and I may be making bad shortcuts by habit).
Can you help us get out of this mode? @Sean P me, I'm on a Mac and I use the trackpad to work.
(And I'm French, sorry for my mistakes).