First of all, I’m really happy with opensuse - and think you have done a very nice job. I’m also think it’s great you made ‘slab’ for us gnome users. However, can I suggest a few improvements?
My major suggestion, is to make the search box work instantly. And work in what ever field you are in. So if “Applications” is selected, and I start typing “Firef” – every application should be shown that matches that.
If you want to keep the “More Applications”. It shouldn’t need to launch a new window - but do it inside slab. On my underpowered laptop, launching this window takes at least 3 or 4 seconds, which really slows down the work flow. BTW: the “filter” in this application browser works really well and would just need to be moved over to the actual slab menu.
And my third suggestion would be to allow us to customize it more. I’d love to be able to add and remove “links” to the right hand margin you have there.