Hi,

Make sure that there is an action given for the menu and also access.rights is granted for the newly created model. To make sire that the whether the issue is with the access rights you can switch to super user mode and see whether the same is visible in superuser mode or not.

Also check whether the menu items has got created, activate debug mode and navigate Settings -> Technical -> User interface -> Menu items and search for your menu.

Different Reasons by which a menu is hidden is explained here:  https://www.youtube.com/watch?v=y8USDEpQvPM

Thanks

Hello,

In this case, verify the following properties:

1-Check this menu having access right, by default

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink ---> 1,0,0,0 change this to 1,1,1,1.

2-Check your menu having an action if so not having  a submenu.

Best Regards 

Have you gave access rights to that models? Please try to add access rights for newly added object/model and check it.