Nah but we may add another setting to make it smaller. FWIW you can disable the thumbnail if you didn’t know.
Not sure what you mean. Subreddit is “community” here on lemmy. Do you mean the color of the subreddit name wherever it’s displayed?
We do have this NSFW toggle on Memmy, but it seems bugged. But if you disable NSFW on your Lemmy account on the Lemmy web ui, I’m 99% sure you won’t be served nsfw posts on Memmy.