As for Windows 10 to return to system menu old look
In Windows 10, Microsoft changed the appearance of the context menu of Windows Explorer – they were a bit wider and with larger arrows beside the drop-down items. This is done obviously for reasons of optimization of the system under devices with touch screens, however, if you prefer the old view menu, you can return them, resorting to small twice registry.
With regedit open registry editor, find and expand this thread here:
Maybe you suddenly find that subsection FlightedFeatures you have not, in this case, you will need to create it manually. In turn, subsection FlightedFeatures you must create a new 32-bit (even on 64-bit systems) a DWORD value with the name ImmersiveContextMenu and the default value, i.e. 0.
Below the new setting into effect, restart the Explorer or reset your system.
The context menu will be slightly narrower and the arrows beside the drop-down elements — less.