main title in posts

Hi there,

First of all: I LOVE Klean. It is such a beautiful theme! Thanks for it.
I guess I read all the posts and got already some answers so I could perfectly customize it. BUT … I am not able to solve what to me seems to be simple problems:

I.
The main title of my page seems to be too long – so it is constantly changing it’s size on the post-pages or depending on the screensize.
I there an solution for it? Maybe
a) just NOT have it on every post-page
b) smallen it at the pages (or in general).
c) do I have to make a logo / jpg out of it – would that solve the prob?
d) do I have to delete the whole title (which would be a pity since I find it very beautiful this way.
f.e. here https://www.trydifferentkeywords.com/the-project/

II.
I do not want to delete the credits of Divjot Singh, since I am grateful he developed the theme. But is there a chance to place it at the end and it in the center of the page?
It is constantly hopping around and I am not really happy that it does. ?? The more since i biggened the font size of the posts already and it got bigger too.

III.
If I scroll at a page the letters continue behind the menu so you cannot read the menu any more. Is there a fix for that?

Thanks alot for any help!
Caya
https://www.trydifferentkeywords.com