it looks like if you mess up the config you can force the node with:
/path/Haveno --xmrNode=192.168.1.1

but the user said it won't actually take a comma separated list of IPs like the "custom nodes" field says it will

¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯ 

 That's a better way than doing a complete reinstall 

 yeah

looks like the guy didn't get the memo about that in time and ended up doing the reinstall
sounds stressful 

 You need to use --xmrNodes not --xmrNode for a node list