Hide title posts

If you are unable to do this via Appearance -> Theme options then it is likely not standard WordPress feature and you will have to do this via the theme.

This has been previously discussed on a thread below:
https://www.ads-software.com/support/topic/hide-post-titles?replies=7

Also check this out : https://premium.wpmudev.org/blog/wordpress-hide-page-title-or-post-title-on-a-case-by-case-basis/

What theme are you using?
Downloaded from?

AccessPress ParallaxVersie: 1.25.7

If you are still stuck with the same problem, may be you should try getting help in the theme support forum:

https://www.ads-software.com/support/theme/accesspress-parallax