How to open a folder in Finder by a single mouse click? (using Icon view) Is there a setting, key combination or similar to open a folder/subfolder in Finder with a single mouse click ?  I need a general solution which works on any folder in effort to minimize needless clicking ... that tiny triangle aside the folder icon will work yet its just too small and only appears using list view ... inspired by same behavior on osx inside a browser to hold down command key and single click a web link ... forcing users to double click is so 20th Century

Is there a way to enable this on macOS (High Sierra or higher)?

On ubuntu this single click preference is a simple setting ;-)
I agree with you on double click.  I bought a multi-key mouse.  I assign a key to double click. Not a perfect or free solution, but better.