How to open last closed window content (directory) when I click on Explorer icon/shortcut or execute it.
I don't believe you can; not without hex editing the program.
You can change the starting location by using the /E argument via a shortcut.
2.How to hide or Show directory and quick access links tree?
View Tab and drop down the "Navigation Pane" button and unselect Navigation Pane. You can get rid specifically of "Quick Access" via something like described in
this article3.File Explorer has hidden UWP version - how to cut or copy and paste in it?
It's not available and is 'hidden' because it barely works. Copy and Paste apparently works as an independent operation. You select what you want to copy, click the Copy button in the lower right, then navigate where you want to paste it, and then click the checkmark. At least that's how it seems like it is supposed to work. I can't get it to do anything. It cannot Paste from the clipboard if you copied File data either.