Why has it no co-odinate system arrows on the camera? It’s not easy to adjust the angle\scale\postion.
in following picture, it has no co-ordinate system on the camera
when I click the cube, it has co-ordinate system nomally.
I have also encountered the same problem. I suspect it is a bug in the camera component. Recently, I was working on a product display project with a transparent background. I unchecked the “Clear Color Buffer” option and the same problem occurred. When moving the camera from the camera perspective, other bugs also appeared. I hope it can be resolved 
Thanks for reporting this issue. I’ve created Camera gizmo has disappeared · Issue #1072 · playcanvas/editor · GitHub.
It is a regression in v1.66 of the engine. We’ll investigate as priority!
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Looking at the picture of @smalle, this also looks like a bug to me. 
This is now fixed! Actually it was fixed yesterday. 
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Thanks a lot!