I just noticed that indeed ovirtmgmt had moved to the right part there. Dragging it to the
left allowed me to bring up the host again!
Then I got to this error when trying to run a VM "Cannot run VM. Unknown Data Center
status.". When I checked the status it says 'Non Responsive'. It turns out
that I was just impatient and at some point I could start my VMs again.
I'm not sure what exactly happened and why I couldn't see ovirtmgmt on the right
before. In any case, thank you very much for the help!!