You obviously use Elementor to edit your pages. In Elementor you can set defaults for many HTML elements, including headings. For example, you can find the global defaults in the Site Settings. Here are the instructions from Elementor: https://elementor.com/help/theme-style-global-settings/
If you have further questions, I would recommend you to contact the Elementor support: https://wordpress.org/support/plugin/elementor/
Hey @exponewshub
If @threadi is correct and you’re using Elementor his reply is what you need.
I have created a preview that might help if you decide to go with Gutenberg Editor 👋
Okay, That’s true, it is a costum design, I have totally forgotten. I guess I have to just reach out to the designer. I thought it is a WordPress issue.
I remember he said something about elementor then.
Thanks a lot @threadi