By Front page description do you mean the words you have written on that page where you have taken the screenshot? They appear in a side block "site summary" which you have to add. If you want the description to appear in the centre of your front page you need to tick "include a topic section " and then turn on the editing on the front page and type in the description; then save.
General help
Cant get front page description to show in 2.3
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