Steps to reproduce:

1. Create template in Zabbix 5.0.3 (Autodiscovery wireless station, signal/noise, etc
2. Create Dashboard, add one graph prototype

Column span = 1
Row span = 1
 

1. Export template 
2. Import template to another zabbix instance 

(template is: https://github.com/sirmax123/zabbix_scripts_and_templates/blob/master/Templates/Ubiquiti/Template_Module_UBNT_AirMAX.xml)

Result on Zabbix 5.0.3 (vertical scrolling as expected):

Result on Zabbix 5.4.11 (paging, and I do not see how to change this):