need help with a theme (20-23), missing pages & post hero images

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hi all,

im a wordpress beginner, altough i do have some basic coding skills acquired in uni. i started writing a blog, picked wordpress and the theme twenty twenty-three (the free option). here’s what happened

1. so, before publishing anything, i went into theme options and removed a bunch of things i dont want from page templates (comment section, some buttons, header & footer etc).
2. then i published a first post ([here it is]). during this process, i was (somewhere) given the option to post a feature image with that post
3. a few days later, i was publishing my second post ([here it is]) and unlike the first one, i wasnt prompted to upload a feature image for it.
1. i am able to add a custom image blog in the post itself, but my desired outcome is for each blog post to have a featured image on the homepage

in addition to being unable to upload feature images to new blog posts, i have two additional questions/problems:

1. how can i remove the grey overlay from the successfully published feature image of post 1 ([again, the URL]) to it)
2. for some reason my wp-admin is reporting that i have no pages at all ([imgur screenshot])

i would very much appreciate help on this one. thank you all in advance

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