Print Base labels 'A4' not 'Letter'

Using LibreOffice Base to print Avery Labels (J8160) but when the labels are printed out, all (in Writer) even numbered pages came out as blanks and all odd numbered pages are correctly printed. When I select to print (Mail Merge dialog box) it briefly shows ‘Letter’ but all the settings are set to ‘A4’.
OS Windows 11; LO 7.4.5.1 (x64)

Please edit your question (don’t use a comment) to mention OS name and LO version.
Do you print labels from a database as suggested by your tab base or from Writer (in which case, retag writer). The procedure is different in both cases.

Avery Labels (J8160) are A4 label sheets with 3 x 7 labels.
Maybe you wanted 8160 labels which are in the Avery Letter Size list and have 3 x 10 labels.

Thank you for your suggestion.
I need to clarify that it is A4 that I want to print the labels and I’m guessing it is set to ‘Letter’ because every other page (even numbered) came out blank.