Show short submodule names in TOC

Sorry for asking a very basic question but I've done some research & no result.

Here's my folder structure:
main-long-name-folder
|--modules
|----|--helper.py
|--test.py

I'm using some functions in helper.py like helper.action1(). I use pdoc to generate HTML. Problem is, after generating successfully, the sub-modules in left sidebar has long package prefix name, for example: main-long-name-folder.modules.

I figure that I can change the name by changing the folder name main-long-name-folder to main then run the pdoc again, but it is not a good way to do because the repo name is fixed, I don't want to change folder name.

Do we have anyway to re-define the package name or changing refname of package to make it a lot shorter?

Thanks a lot.

Reproduce the reported package structure and generate its HTML with pdoc, then trace how the left-sidebar table of contents derives displayed submodule names. The work is done when the sidebar can show short names without renaming the repository folder, with coverage for the nested-module example.