Wrapping a columns(2) might helps.
#set page(height: 10em, width: 20em)
#columns(2, align(center,
table(
align: center + horizon,
columns: (2fr, 3fr),
table.header("Left", "Right", repeat: true),
[l1], [r1],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l2], [r2],
[l50], [r50]
)
))
