An excellent program, but I did not find in the menu how to disconnect from the server.

You can exit, but you won’t be able to disconnect.
In addition, it is desirable (as in wincmd) in the upper right corner of the window \.. I.e. to the root and go higher

Please see
https://winscp.net/eng/docs/task_connections#closing

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I do not understand the second part of your post. Please try to explain.

1.I meant some button or menu item to disable
2.In wincmd, in the upper right corner of the displayed folder there are icons for going to the root and one level higher, but you don’t. Only in the left corner one level up. Also good, but unusual

to view and edit files. for example Notepad++ or another
Yours is good, but habits are stronger than reason :)

Sorry, I do not follow. What takes long time? Clicking the X button on the tab?

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In wincmd, in the upper right corner of the displayed folder there are icons for going to the root and one level higher, but you don’t. Only in the left corner one level up. Also good, but unusual

WinSCP has the same buttons. See the yellow folder icons with angled left/upward arrow and slash above both panels.
https://winscp.net/eng/data/media/screenshots/commander.png

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to view and edit files. for example Notepad++ or another

You can configure any external editor you like.
https://winscp.net/eng/docs/integration_editor