CAN'T GENERATE DIFFERENT PAPER SIZE FORMATS (A5, B5...) USING DOMPDF

[ARIA-Mydoc]

THE DOCUMENT TEXT DOES NOT DISPLAY ON THE PAPER WITHIN PAGE SIZE DIMENSIONS. I HAVE TRIED DIFFERENT METHODS:

• I FOLLOWED YOUR PAGE SIZE INSTRUCTIONS AND DIDN'T WORK HERE: https://github.com/dompdf/dompdf/blob/v0.8.2/src/Adapter/CPDF.php#L45
• I APPLIED MARGINS ON MY DOCUMENT YET THE SAME THING DIDN'T WORK
• EVEN WHEN I CLICK PRINT > PROPERTIES > CHOOSE LANDSCAPE & A5 SIZE PAPER, IT DOES NOT WORK
• I FOLLOWED THE INSTRUCTIONS AND TROUBLESHOOTINGS OF OTHER PEOPLE POSTS ON SOF BUT STILL HAVING SAME ISSUE: https://stackoverflow.com/questions/25376901/how-to-set-custom-width-and-height-of-pdf-using-dompdf

VERY TIRING AND TOOK A LOT OF TIME TO FIGURE OUT THE ISSUE, HOPELESS NOW. IS IT A LIBRARY PROBLEM? OR WHAT IS THE MATTER?

SEE ATTACHEDD SCREENSHOTS