Template editor

Is it possible to adjust the number of posts to show on the blog posts page? For example, I want to show a link to "Older" posts less often.

Is anyone else seeing this? Changing the date format in the 'edit template' screen allows me to select a different format, but the new format is: not applied to the preview not retained if I leave / return to this screen not applied to the live site (confirmed with debug function, where dateFormat in JSON remains original value) The template is unmodified and correctly uses {{date}}. Other changes in the edit template screen (such as font, font size and line spacing) are correctly applied.

I am trying to have a main page and want the date completely gone. How do I do it for a post?

Year ago I backed up my custom template. Thought there was an option for that, but not seeing it on the Templates page. How do I do that?