Help! I Broke Something In Mushclient!

So I went to click back into the window on my second screen, and I clicked a small, grey bar, which undocked the bar.
When I went to put it back, it did this!
(Names erased for user privacy, but other text kept so you get an idea of what is going on)

https://cdn.discordapp.com/attachments/983387932725489704/1136052347370483792/image.png

Thank you.