Numbers in contents sidebar in Open Textbooks theme 2.0.0

This is probably something many of you are fully aware of, and maybe it’s already been asked, but I haven’t been able to find it, so here it goes (with apologies):

It seems that the contents sidebar in the new Open Textbooks theme (2.0.0) with PB 5.0.0 always adds numbers before each part title and letters before each chapter title. This is confusing in books which include custom numbers as part of the titles, such as:

Is there any way of disabling this?
Thank you very much,

Hi Luis, I’ll be taking a look at this in the next few days.

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Thank you so much @brad !