Windows 10 – Switch Virtual Desktop While in Fullscreen Remote Desktop

Yes there is!! It's called zVirtualDesktop. You can configure the hotkeys any way you'd like. It also has a nice feature called DesktopView which lets you drag and drop your windows across desktops. This view also lets you quickly navigate to any window.

https://github.com/mzomparelli/zVirtualDesktop

Here are some screenshots.

You can choose from several sets of system tray icons that indicate which desktop you are viewing.

This is DesktopView which lets you move your windows around or navigate to a window.

In the main settings window you can configure hotkeys and set wallpapers for each desktop

Sometimes when you are trying to send modifier keys (win/ctrl/alt) and the triggering string has modifier keys as well, you need to wait for the triggering keys to be released, or they will affect the replacement string as you are finding out.

Try using KeyWait to accomplish this. Notice we are now using hotkey syntax vs hotstring

#LAlt:: ; switch to next desktop with Windows key + Left Alt key
  KeyWait LAlt
  SendInput #^{Right}
  Return

#LCtrl:: ; switch to previous desktop with Windows key + Left CTRL key
  KeyWait LCtrl
  SendInput #^{Left}
  Return

For purposes of switching desktops the above worked for me.

On other occasions, there are times when even this approach doesn't work, and there is another possible solution. Instead of key waits like these...

KeyWait LAlt
KeyWait LCtrl

...replace with the corresponding one of these keystrokes to clear the state of the key:

Send,{LAlt Down}{LAlt Up}
Send,{LCtrl Down}{LCtrl Up}