Assigning display of modules to OSB pages

I assigned the display 'Customer layout: List all orders history of customer' to a menue item.
1. I assigned the module 'main menue' to display in this menue item
However no menue is displayed as soon as I select the menue item

2. I tried to assigned further modules to be displayed at the bottom of the website, as I did with all pages.
I was able to mark them in the module assignment, but after saving the settings, they are reset to not displayed.

Can this be changed?

Hi,
I am afraid this is Joomla issue, it isn't relate to OS Services Booking. If you want to assign specific Joomla module to menu item, you can open the module for modifying, in tab: Menu Assignment, you can select the menu(s) that the module will be shown.
Thanks
Dam