How to give 404 if the request goes to /index.php/bla?

Question

1C-Bitrix

Good afternoon. Tell me how to set up pages like /index.php/bla/ , /about/index.php/sdfsdf give out 404.
404 works fine, except when there is index.php in the address 404 does not give out

Answer 1

Make redirects in htaccess at the same time remove duplicate pages

Answer 2

404 works fine, except when there is index.php in the address 404 does not issue

No, it doesn't work well for you.
/index.php/bla/ - what do you generally get at such addresses?
With a probability of 80% you have done something in urlrewrite.php and with a probability of 19.99% in the conditional ".htaccess"
You should look at them in their entirety.