New
#1
Live Tiles are a different display from Notification centre items.
i.e. You can switch off Live Tiles but still have Notification centre items. Your choice.
Mobile Hotspots:
Settings > Network & Internet > Mobile Hotspot > Off, or whatever is your choices on that page.
Notifications & Actions seem to have a number of bugs as some things work partially and others do/don't work.
The Add remove Quick actions are just the Icons squares at the bottom, nothing to do with notifications as such.
I am connected to WiFi only - and I have succeeded in turning off all but the ones I want to show, which are "All Settings, WiFi, Connect, Location and Network". It works for me by just clicking All Settings>System>Notifications and Actions>Add or Remove Quick Actions and turning "off" all those I don't want. Really fairly easy.