It seems like you are using some page builder for the inner page and want that page as front page.
Everything you have done is 100% right.
The only thing you need to do now is,
Please go to Appearance => Widgets
and from Home Main Content Area remove all widgets.
This will solve your problem
Theme function like this for Front Page.
- If you select Your latest posts from Reading Settings, latest posts will display
- If you select A static page from Reading Settings, the content from that page will display, however if there is widgets in the Home Main Content Area, these widgets have higher priority than the page content, so these widgets will display in front page
- If you want to display content from page, you have to empty that sidebar-areas, if you want to display content from widget you can use available widgets and build your sites.
Hope this will help you.