Unable to hide title/tagline in pages and articles

Hi, I tried to follow the instructions in order to hide both title and tagline in all my pages and articles but I include both with my logo. While the title and taglint disappear from the homepage, it is still here in my other pages and articles. I tried modifying it on every page with the pencil blue button, checking/unchecking the "show tilte/tagline", it disappears on the preview but it doesn't work when I refresh. Here's my website if you want to check : negatif.co Is is a bug or just an unsupported feature ? Is it just for pro version ? Is there a way to change it simply with aditionnal CSS code ? Thank you very much, Love this theme.

Site Identity: How to disable Site Title and Tagline? Go to “Appearance => Customize => Site Identity” Uncheck “Disable Site Title and Tagline” and it will not display Site Title and Tagline Finally, click on “Save & Publish Note: You can also edit the text of Site title and tagline