In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize the theme Customizer page will appear .
Here You have to follow this Path : Go to Customize -> Page Templates -> Gallery Page
Now scroll down a bit till Header after reaching here you can Add Section Title , Subtitle & Description in Gallery Section.
Then click on Publish.
Please follow this Screenshot for Reference :
In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize the theme Customizer page will appear .
Here You have to follow this Path : Go to Customize -> Page Templates -> Gallery Page
Now scroll down a bit till CONTENT then open the Gallery toggle and here you can Add Gallery Content in Gallery Section.
Then click on Publish.
Please follow this Screenshot for Reference :
In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize the theme Customizer page will appear .
Here You have to follow this Path : Go to Customize -> Page Templates -> Gallery Page
Now scroll down a bit till Gallery Column then click on Column toggle and here you can Manage the columns in Gallery Section.
Then click on Publish.
Please follow this Screenshot for Reference :