dual source record viewer is gone

I really tried to find it, but I can't activate dual pane source/record viewer. I only see one of both.
What do I miss?

dual-pane.JPG (459.45 KiB) Viewed 941 times

I'm thinking your screen resolution might be too low. I recommend the following minimums:

24" @ 1080
27" @ 1440
32" @ 2160

Have you tried toggling off the Inspector?

Thanks for the suggestion to turn off the Inspector. It helped to get the dual pane back

But that UI behaviour shouldn't be the case. Even with Inspector I can scale the window above the timeline and there is enough real estate for 4 source/record monitors.
My screen resolution should really be sufficient.

resolution.JPG (48.4 KiB) Viewed 687 times