It doesn't let me activate Ajax, help

It doesn’t let me activate Ajax, help.
Hello, I have Nextcloud installed on docker on a raspberry pi 4 and by default it activates cron and does not let me activate Ajax, since every 5 minutes it is running cron

How can I activate Ajax? thanks.

ARM Raspberry pi 4
Debian 10 (Raspbian buster)
Nextcloud v17
Docker
OMV5