sorry, not following…  are you asking if using the mark all posts read (reset button?) marks the current post or all posts?  If so, the latter… it will mark all unread posts as unread…

No ..sorry I’m explaining very bad
How I reset topics unread? only with button reset or also reading the posts?
because if I ready the only post unread not reset counter unread posts….
thank you

I’m sorry I don’t think I really understand either.

Are you asking if there is a different way to get rid of unread post notifications? Or are you saying that once you have read a post it still shows as unread?

have you read this faq:  https://simple-press.com/documentation/codex/faq/problem-with-post-edit-buttonow-to/faq-understanding-unread-post-lists/

explains how the unread stuff works…

so it may not mark immediately, but should once you log out or time out…

does that help?

Thank you …it’s all in english …not easy for me….but  I understand that only after a few minutes (20 min) or after log out, mark read post notifications…

that's right?

Are you using some sort of WP cache plugin> It sound slike you might be and of that is the case could you take a read of this:
https://simple-press.com/documentation/codex/faq/troubleshooting/forum-displays-wrong-information/