If the Parameter pane is open, using Refit Sheet to view the entire sheet defaults to zooming it to fit the window as if the Parameter pane is close hiding the bottom of the sheet.
There is an icon in the upper right of the Parameter pane that looks like
Clicking on it tells Schematics that it should refit the sheet in the remaining part of the window.
If you want to return to the "hide the bottom section" setting, the icon changes to
that you can use to change the setting back to default.