Where are Tablet & Landscape Mobile Options? Editing Tablet layout in horizontal view!

Have a project I wanna design for Tablet in horizontal view. Have a lot of clients that use them over laptops.

I understand that RM is meant to used Desktop views for tablets, but every time I see one of my projects on a tablet, it’s clear it isn’t scaling properly to fit the entire screen. There are widgets displaying poorly, pages are clearly too short etc.

Trying to find the Tablet & Landscape Mobile Options to fix it, but that looks to have moved from it’s old spot in the UI since the last update (this 10 month old tutorial looks like it’s the last version of RM: Designing for Mobile and Tablets with Readymag - YouTube)

Anyone got any ideas?

Thank you!