Solidres dompdf not found, theme issues etc

Hello team,

we are using joomla 3.9 with php 7.1, we have some issues with solidres,
for your information we have Hub subscription

1. while using default theme, all menus are working fie, when we using downloaded themes like Luxuria, BlueBee etc, we are having issues, only home menu are there other menus are not showing anywhere, theme looks weird, is there any documentation for theme installation?

2. in our solidres home page we are getting a warning message
Hub plugin needs a published menu item with type Solidres - Show the frontend partner dashboard while seeing online documentation it shows menu item type : show the frontend hub search page but we couldnt see that option in our dropdown, please help, any settings to do.

3. all the plugins except dompdf working smooth, while uploading dompdf plugin zip file, it shows nothing, no error/success message

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