There is an option to change the Product but there is not a configuration setting to change the landing page option within the product.
In Jira Cloud under user management you can set the default product application for all users (i.e. either Jira or Confluence) as covered in "Set your site's landing product"
For changing the landing page within the Jira application check out the following feature request and make sure to add a vote:
Hi community 👋, as every Monday we're bringing you a quick update on what happened in the Atlassian ecosystem last week. There were a few interesting events like for example the announcement of th...
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