The Tor browser is useful when you want to read regionally restricted websites, for example.
Unfortunately, the Tor Browser also changes the browser agent string, so that some websites that check it for plausibility refuse to display the website because of the fake user agent string.
The fact that some websites can also deny the Tor Browser on the basis of the IP address used by the Tor Browser is known and explicitly not meant in this question.
Example for fake user agent string of the Tor Browser:
Mozilla/5.0 (Windows NT 10.0; rv:102.0) Gecko/20100101 Firefox/102.0
The not faked one should be about p.e. the follow:
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
The Browser-Agent string can checked on webpages like:
How can I disable the named current Tor browser from faking the user agent string?