Default paper size for exported pdf

[mokazemi]

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When xepersian is used, default paper size is US Letter, even though I've set tlmgr paper a4.

I should use [a4paper] after documentclass to solve this issue
But when I use xelatex without including xepersian, there's no problem.

XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex 2020.8.13)

[hadisfr]

Could not be reproduced with XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex) and XePersian v36.3, 2020/05/17 on Linux Ubuntu.

Example:

\documentclass{article}

\usepackage{xepersian}
\settextfont{Yas}

\begin{document}
سلام
\end{document}

The produced pdf file is in A4, Portrait (210 × 297 mm) size.