I can't get my NAS?

I recently made a folder on my laptop available offline from my NAS and since then I have not been able to access the NAS with my laptop, which then only shows me my offline folder. I can't undo it and syncing doesn't help. Does anyone have any idea what I can do there?

Can the NAS still be reached via the browser's address in the home network?

Of course, and everyone else in my family who doesn't have the offline folder has no problem with it

I just tried to do that with the offline folder.
For me it works with my Synology NAS without any problems.
Even though I have disconnected several times and made changes to the folder on different devices.

So I don't know where to start looking.
Control Panel \ All Control Panel Items \ Sync Center \ Sync Results

Under this path, you can quickly access the synchronization center via Explorer and check whether it is still synchronizing with you or deactivate it under "Manage offline data".

How do you usually get on the NAS? Via Windows Explorer or via a program?

If you go through Windows Explorer, what will appear when you click Network in the left navigation? Doesn't the NAS show up? If it appears, then it also has a name → Click in Windows Explorer on the top of the address bar and enter there (although you should of course enter the name of the NAS)
\\ tigernas
and press enter.
Do you come to the NAS then?