1. click edit 

 

 

 

 

2. click content blocks

 

3. click add block

 

 

4. click item gallary

 

 

5. You can only select the existing group, so the item gallery is exactly the group content.  What group you choose, group's content including whatever apps or maps will show up on home page as gallery item. 

You add or remove item in gallery all through add or remove items in group, 

 

 

 

6. sort the order of item

by

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