Can't edit Footer static block using Elementor
If you imported demo content that was created using Elementor, you need to enable this editor for static blocks and products.
Go to Elementor > Settings > Post types > check Static Blocks and Products.
Then go to Static blocks in the Dashboard > edit Footer using Elementor.
In case changes are not visible on the Frontend still, go to Theme Options > Speed Optimization > disable "Static Blocks Cache" and "Remove Query Strings From Theme Static Resources", clear the cache of your browser/cache plugin and check the result.
You will be able to activate mentioned Speed Optimization settings once all changes for static blocks will be done.
If your problem was not solved by doing this, please check topics on our support forum - https://www.8theme.com/forums/xstore-wordpress-support-forum/ , and submit a new topic to get assistance from the support team.