Hi Tayronasoft,
Unfortunately there are no options to change those filters in the block, this is the default behaviour provided by BuddyPress.
However, as a courtesy, here is a CSS snippet that you can use to hide the alphabetical filter :
/**
* Hide the alphabetical filter in groups block
*/
div.grimlock-buddypress-groups-section #groups-list-options > a#alphabetical-groups {
display: none;
}
To add this code snippet to your site, we recommend that you paste it to the Custom CSS panel of your WordPress Customizer. Just go to your dashboard and navigate to “Appearance > Customize > Additional CSS”.
Pasting your code snippet there should do the trick for you.
It’s important to note that we only share snippets as a gesture to solve small requests or to fix an important bug. No snippets will be shared otherwise.
If you want to go further with the customization of your website, we advise that you require customization work.
Hope this helps !
Regards,