1. From main page, Edit with Elementor >> Site Header:
Graphical user interface, application, website

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2. Navigate to where you want to change the font size, click the Pen icon:
Graphical user interface

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3. Under Style section, click the Pen icon at Typography raw:
Graphical user interface

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4. Move the pointer around to adjust the size as needed:
Graphical user interface

Description automatically generated