Vertical Multi-level Navigation Menu

Hi everyone,

Is it possible to create or what is the best approach to create an expandable menu to the right for navigation purposes?

Something like in this link:
Pure CSS Vertical Multi-level Navigation Menu

Since the link you posted is a css only solution, yes, with theme.css.
This will require some knowledge of css and html.

With the canvas you can do it the perspective way a bit easier.
Look into css grid and you should be able to make this with columns in canvas

The link was mostly to show exactly what I was looking for.

Grid View and canvas can do the job? I thought grid was only for showing components in different sizes

no, use the canvas view Perspective - View Canvas - Ignition User Manual 8.1 - Ignition Documentation
with styles property off css grid combinded with the css hover effects from the example
CSS Grid Layout