Homepage
Quiet's one homepage setting: how many posts the Latest writing band lists. Everything else about the homepage is decided by the pages you publish.
One setting. Everything else about your homepage is decided by which pages you publish and the tags you give them, which is covered in Homepage sections.
How to get here:
Go to Settings → Design & branding.
Click Customize, then open the Theme tab.
Open the Homepage section.
Home Latest Count
How many posts the Latest writing band lists: Four (default), Six or Eight.
Pick a number and save.
Reload your homepage.
The home Latest writing - Count setting
The home Latest writing - Four posts
Posts are listed newest first, in two columns on a wide screen and one on a phone. Podcast episodes and films are not included: they have their own bands.
This is not your archive's page size
The archive at /articles/ shows 12 posts per page, which is fixed by the theme rather than set here or in Ghost Admin. This setting only affects the homepage band. See The archive.
Looking for the portrait switch?
Whether the introduction shows your portrait is decided by the #home-intro page itself: give it a feature image and the portrait appears, leave the image off and the introduction is words alone. The centred, split and panel layouts are chosen with tags on that page. See Introduction.