Hi!
You can either use JSON editor online or edit sitemap within a text editor, like Notepad++
Selectors are encapsulated within curvy parentheses:
{"id":"tvguide","type":"SelectorElement","selector":"div.tv-guide","parentSelectors":["_root","ND-Page-Link"],"multiple":true,"delay":0}
And separated by a comma
So all you have to do is to select particular selector within { }, and move it within sitemap.
Example of your selectors reversed:
{"_id":"test-test","startUrl":["https://www.ziggosport.nl/programmagids/"],"selectors":[{"id":"ND-Page-Link","type":"SelectorLink","selector":"a.tv-guide__days-switch__link.tv-guide__days-switch__link--next","parentSelectors":["_root","ND-Page-Link"],"multiple":false,"delay":0}, {"id":"tvguide","type":"SelectorElement","selector":"div.tv-guide","parentSelectors":["_root","ND-Page-Link"],"multiple":true,"delay":0}]}