The transform, rotate, etc buttons won’t stay on screen. Toggling show toolbar briefly shows the buttons… but then they quickly disappear before they can be used. Reloading default layout doesn’t fix it. Neither does ue4 layout.
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Im having the same issue with 5.5.3 did you ever find a solution to this?
same here, any news? version 5.5.4
This has been an off and on problem for me with Unreal 5.
[What is so frustrating is if you spam ctrl+shift+t enough the toolbar is shown nice and great for a split second before it flickers away and collapses to what it thinks is a better collapsed view, instead of where those toolbar buttons fit nice and should be…]
I feel like I’ve seen it often, because I move my computer around a bit to different displays. So on a tv (monitor), I had the issue, and I set the application scale (edit => editor preferences => appearance => application scale) to near minimum to see the right side of the toolbar… Expanding the viewport over the details panel will also get that part to show (unreal 5.5.4) 
I looked at the bug reports, and this issue has a target fix in ver 5.6. not the greatest news considering I’m pretty sure the problem has been on the forums since 5.1; Unreal Engine Issues and Bug Tracker (UE-239543)