How to import an Excel file?
You can import from the FILE menu on the full-screen edit screen.
Select the file to import using the file selection dialog or drag and drop.
Can you make the Spread panel invisible?
Yes. Press the ‘...’ button at the top of the Spreadsheet panel and select 'Hide Spreadsheet' from the drop-down menu that appears.
However, it cannot be made invisible in the old issue view, which will be deprecated from March 31, 2021.
Can you use mathematical formulas?
Yes. You can use more than 450+ formulas, including SUM and AVERAGE.