This is for Version 2.11.3-5ak that in openSUSE packages appears as kalarm5 version 15.12.1-12.2

There are no options to set recurrence rule to 1 or 2 hours, or 10  minutes. In the screenshot it's an old alarm set with previous kalarm (4.14.10-3.10). The recurrence used to be set to 5 min and it shows in the Recurrence tab title but there's no way to change it. For new alarms recurrence is automatically reported at 1 min (in the tab title). 

Daily/Weekly/Monthly/Yearly choices show relevant editing options as expected. 

Reproducible: Always

Steps to Reproduce:
1. Launch Kalarm
2. Select New and choose any type of alarm
3. Click on Recurrence tab
4. Select Hourly/Minutely

Actual Results:  
No options to edit recurrence

Expected Results:  
Options for setting hours and minutes for recurrence, more or less like in KDE Task Scheduler (where it works).