How do I close the AI chat sidebar (on the right)?

[plutonium-239]

This sidebar on the right with AI chat, Properties, Calendar, TOC and Frames

Can't figure out how to close, the resize handle doesn't work and there is no button to collapse it.
I did not have it open before, just wanted to check out the new AI chat button in the bottom right.

[bomberstudios]

You should have an icon like this on the top right of your window, to toggle the right column on and off:

[plutonium-239]

Thanks, for future reference the icon is in the titlebar itself on windows (didn't really connect that because it was outside the frame and not aligned to it either)