FILE EXPLORER forces to reduce length of PDF filenames down the subfolder chain

I am not sure how to put it, but the more SUBFOLDERS are created in FILE EXPLORER and the SHORTER needs to be the PDF filename ... this becomes really annoying when trying to maximise the use of file-explorer with multiple subfolders, as the PDF filename goes from "november-analytic-invoice-customer-01012024.pdf" to  "nov-analytic-inv-cust-01012024.pdf"... etc, the more subfolders are created. Can someone show me how to increase the number of DIGITS of a PDF filename undependadly of its position down the subfolders menu, to say: 20 digits? thank you.