Again many thanks Paul! Naturally, the route works via System > Site Template Styles > select active default template > Template Options. Great!
But unfortunately I could not manage the logo that way, e.g. to upload a new logo that way and also to change the height size of the logo. The response was error message: "Error undefined" (please find the screenshot below).
I chose to replace Yama's logo with my own SVG logo by uploading it to the server via FTP program.
I would be grateful if I could get advice to make the logo manager work (both in changing to your own logo and in adjusting the size)
Thank you in advance!
Greetings from Finland! Inguar