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Browse your report in the Microsoft Power BI webapp and select the page you want to be displayed when the Confluence page loads up.
From the address bar of your browser, copy the part of the URL address that goes from ‘ReportSection’ (included) to '?' (excluded).
Paste it in the ReportSection override field of Microsoft Power BI for Confluence settings.
Filter expression
See Microsoft documentation at Microsoft’s documentation here explains how to filter embedded reports adding URL parameters:
https://bit.ly/3qR8gTP for more detailslearn.microsoft.com/en-us/power-bi/collaborate-share/service-url-filters
The Filter expression field in Microsoft Power BI for Confluence uses the same query string parameters to filter the report. Fill the field with the same parameters you’d add in an embed URL.