The 3/5 layout is the layout of the single gallery post.
It isn’t possible to set a single gallery for homepage by default.
But it is possible to redirect by plugin:
Download a plugin under Plugins → Add New that allows adding custom links to posts or redirecting posts. One such plugin is “Page Links To” however please do your own research to determine the best plugin for you. WordPress SEO also works for this purpose.
Create a page called “Home” and add the link to this gallery post wherever your plugin allows. For Page Links To, the field is at the bottom of the post.
Click Publish
Go to Settings → Reading and select Static page, then select the Home page in the Home Page menu.
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