If you would like to use an emoji on the Loop desktop app, then you will need to familiarise yourself with some easy to do keyboard shortcuts.
For Windows 10 users, you will need to press the following to make the emoji menu popup:
Win + . (period)
Win + ; (semicolon)
You can change the category by press Tab/Shift+Tab. You can also select a different skin colour by clicking the button on the top right of the panel.
For MacOS users, you will need to press the following to make the emoji menu popup:
Ctrl + cmd + space