A green message appears "installation of the add-on was successful"
III. HOW TO CONFIGURE GALLERY CONTENT ADD-ON (GLOBAL CONFIGURATION)
After having done installation, the add-on surely appears in Add-ons Manager
Click on Content - Gallery, you'll see options on tab "add-on" like Image Maximum Size, Image File Types, lightbox options
On the tab "front-end options", you can choose "grid style" option, as well as adjust width and height of grid images. The option "Image title position" allows you to decide the position of the image title "On overlay of thumnail or under the image"
IV. CONFIGURE LAYOUT BUILDER
Go to layout section > Elegant - Default or open your own layout
Add a new row or column to present the Gallery content, select a type: Gallery
V. CONFIGURATION IN A DETAIL ARTICLE
Back to Articles, and click "New" to create your article
Fill in your content, and under the content section, you scroll down to see the "Gallery" section
Add a title to the gallery, and you can adjust the title font with elements like font family, font weight, letter spacing, font size, font style ... Morever, there are other options to edit the title including title color, title hover color, title margin top, title margin bottom, custom class.