Module development and code questions

Trying to use the views grouped filter instead of exposed but trying to override the feature when using checkboxes and "allow multiple" it replaces them with a select after going above 4 filter options. It's in the filter plugin for Views in the spot below. Is there a way to do it via hook or is it too hacky of an ask?

Hello, first of all thanks to ready my post in "Low English", sorry but it is not my native language.

I am not developer, i am systems technician but in my job we have changed from WIX to DRUPAL and i have migrate all content (published content, not configured the core site) WIX was totally family friendly, i had a editor to the content in mobile devices and another to the computers.

I use MathJax (a JavaScript display engine) on my Drupal 9 website. This engine uses JavaScript to convert mathematical formulas, given in LaTeX notation, into .svg format. JavaScript is executed on the client side. My question is whether it is possible to run MathJax on the server, that is, to generate the svg formulas on the server instead of on the client side?

Once I updated a page via admin panel, I need to programatically flush all the caches, then get the page source code and write it to a file. I use the following code inside of my module:

Hi

I'm using headless Drupal via rest API.

i want to create a link that when user open it the user was authenticated to continue purchase a product .

can some one help me?

I want to store some nested data/configuration per user in Drupal. Also the user needs to be able to view/edit it.

Following format: