Hello,
In the Theme Settings, you can change the only font size in this situation, You can adjust the font settings by navigating to Theme Settings > Typography > Advanced Typography, and creating a new rule for the “Page title” item.
For detailed instructions, please refer to the documentation:
https://xtemos.com/docs/woodmart/advanced-typography-settings/
If you want to change the font size only on mobile devices, Try to Use Theme Presets to apply conditions for mobile devices:
Go to Theme Presets and select the “Is mobile” condition. https://ibb.co/yR89vmL
Then go to the Theme Setting of this preset and apply the typography settings.
Check our article about theme presets – https://xtemos.com/docs-topic/theme-settings-presets/
Best Regards,