@mahesh
Thank you for the answer!
Maybe I expressed myself badly.
I did not have a child theme installed, just the normal theme.
And I set a logo picture through customization. Also changed background colour.
Now after I installed and activated child theme, contents of the page are same, just the background colour is changed back & also it doesen’t show my inserted Logo picture.
Why is it not showing the same page through child theme as original?
I thought it is supposed to?
Should I just change the settings to this way on child theme like I already did on the normal theme!
Thanks!