plugin has a conflict with another plugin

Hi artifleur,
Thank you for your feedback.

I used it with “Bookly” plugin

Is this plugin?
https://ww.wp.xz.cn/plugins/bookly-responsive-appointment-booking-tool/
I think I look like to working is correctly.
Screenshot: http://gqevu6bsiz.chicappa.jp/?attachment_id=1673

And if you want show to the non-Administrator, I think that need to change the code of Bookly plugin.
Because I think this menu show the sidemenu is possible only Administrator.
Please see the Line 191 of backend/AB_Backend.php.

Thanks,
gqevu6bsiz