Hello Cr3atorf1lm,
In order to display the Mobile Filter button, please navigate to XStore > Theme Options > Woocommerce (Shop) > Shop > Shop page layout. There, you must select the Sidebar Position For Mobile as Off-Canvas and save the settings.
Please refer to the image provided at the following link for further reference: https://postimg.cc/G9B7n6qZ
Best Regards,
8Theme’s Team