Since version 3.3, Astra theme default font icons have been replaced by SVG icons. When SVG support is enabled, the astra.woff file is not loaded anymore by default. You can find out more information details in this article.
Thus, adding the filter mentioned in this document is no longer needed unless you decide to disable the SVG support.
Astra by default loads a very tiny font icon library from an Astra.woff file. You can see a list of font icons here.
Here is a filter which can be used to disable loading this font – `astra_enable_default_fonts`
You can add this filter in the child theme’s functions.php file as shown below. Just copy the following code and paste into the functions.php file.
Example usage –
add_filter( 'astra_enable_default_fonts', '__return_false' );