In Builder Construction Architect Renovation theme you can build a gallery with lightbox and navigation arrows using the "Jetpack by WordPress.com" plugin:
In order to create a simple classic gallery, like this example: https://construction.vamtam.com/standard-jetpack-gallery/, please follow the steps below:
Step 1: Please add the "Jetpack by WordPress.com" plugin and activate it. Here you can read more about this plugin: https://wordpress.org/plugins/jetpack/
Step 2: Please go to Dashboard > Jetpack > Settings > activate the "Display images and galleries in a gorgeous, full-screen browsing experience" feature
Step 3: There are some more options in Settings > Media > Image Gallery Carousel > tick the "Display all your gallery pictures in a cool mosaic" option. Change any settings you need. You can do it at later stage as well.
Step 4: Please go to your page/post editor and insert a gallery by clicking the standard Wordpress button Add Media:
You can watch the video guide Using a Media Library: http://support.vamtam.com/support/solutions/articles/183764