Windows Hyper V - Cant get to Enhanced Session Button

Just loaded PopOs and hit the 25% size button, Not on purpose and now I cannot resize the VM window. the system is defaulted to this size so I can not load any new VM’s . I cannot get to the Enhanced Session button or help its locked here. Help Please !!!

It won’t resize if you over over the corner of the guest? What about full screen? I haven’t used Hyper-V since 2008. And these are my best ideas.

Thanks for your reply. even in full screen you can not access the Enhanced Session Mode and its defaulted for all the VM’s