What is the required distance between rows in the funeral prayer, and is it true that joining the rows in it is not obligatory due to the absence of bowing and prostration?

There is no defined limit for the distance between rows in prayer, including the funeral prayer. However, what is required is proximity between the rows.

In prayers other than the funeral prayer, a reasonable space between rows is maintained for bowing (ruku') and prostration (sujud).

The funeral prayer does not differ from other prayers in terms of straightening the rows and ensuring proximity between them.

The distance between rows in the funeral prayer can be closer due to the absence of bowing and prostration.