Few Issues

The search bar on mobile automatically closes whenever trying to write anything inside it, works fine on PC though.
There is a large gap between last posts on a page and navigation to Older and Newer posts buttons, is there any way to decrease it (its not in the Demo site apparently)
On the demo site given on the author’s website, the page navigation is by numbers but the latest theme has set it as Older posts & Newer posts. So, which parts of theme do I need to change to make use of WP-navi etc. plugins or how to replace it to page numbers otherwise. Couldn’t figure out myself.
Similarly there’s Related posts function on the demo sites, I don’t see anything regarding it in usage.
Not sure if it’s actually theme related but does having a stickied post on the front page not count in the ‘no. of posts shown on one page’ setting, since it becomes odd number on front page, and even on the rest.
Lastly just wondering how to find similar themes which are good for showing posts with the use of only title and featured images on blog and without any post description.

Meanwhile I doubt of theme author’s response here, since there’s no reply on previous support posts for this theme and the last any author reply was 3 months back.
Any other user’s help would be appreciated as well. TIA