You may want to change the account you're connecting on your Data Studio reports; for instance, switching an Instagram page to another Instagram page data.
To do it, go to Resource - Manage added data sources.
Now, go to Edit on the data source.
Then, click on EDIT CONNECTION.
You'll be able to change the parameters of your connection, such as your accounts (e.g. Facebook Ads accounts, Facebook pages, etc.).
Once you're done with the changes, click on RECONNECT.
Google Data Studio will show you the changes in the fields between the accounts you're connecting. Click on Apply.
Click on Done and go back to your reports that will display the new data in all the charts that have the same data source linked to them.
More about managing data sources on Google Data Studio: