Empty/Blank Boxes on Tax Information

i’m filling out the financials section of the FAFSA form and it’s asking me for different 2023 tax return information, but like 70% of the boxes are blank. i’m using the “where to find my 2023 tax information (2025-26)” link to locate everything, but while some of the boxes on my moms 1040 have numbers, most of the boxes i need are blank. does that mean i should leave each box that doesn’t have anything blank when filling out the fafsa form? should i put a 0? what do i do?