TF 1.3.8 not showing window buttons when opening desktop drives

Have a weird one for you.

iMac 5K 2014 (27 inch) - TF 1.3.8 , Big Sur 11.0.1 - All fine

Macbook Pro late 2018 (15 inch) - same software as above. TF works fine except that when I open a drive on the desktop I don’t get the 3 window management buttons and the grey background. If I click over the Hyperdock preview window in Finder dock the buttons appear on the already open Finder window on the desktop. See below screenshot :

Hyperdock on both machines, disabling window preview in Hyperdock does not resolve the issue.

After clicking the preview window all comes good :-

And with TF unloaded , window displays as normal

Fixed it… it was caused by an option in General setting. Thank you, this forum is gold !!

On a side note , does TotalFinder run in M1 Macs ??

I don’t have M1, ordered, still waiting for a MacBook. One user reported that it does not work. But I cannot comment further.