display of collapse labels in PDF

[johntruckenbrodt]

Description

Hi there. I really like the collapse extension and it looks great in HTML. However, I would also like to generate latex files with sphinx to create a PDF file. Unfortunately the labels of the collapsibles go missing. Here's the PDF output of your documentation example:

I know, the collapse functionality is intended for HTML but it would be great to have both options depending on the target audience.
Do you think this could somehow be made possible?

Version

• Operating System: Windows 10
• Python: 3.10.5
• sphinx-toolbox: 3.1.2