I have seen no material evidence to this effect.
Here's a user's comment that listed three sources:
https://lemmy.world/comment/13069715
She’s taken a stance, multiple times. The left doesn’t want to hear it.
March - https://www.npr.org/2024/03/04/1234822836/kamala-harris-benny-gantz-gaza-cease-fire-israel-hamas
July - https://www.politico.com/news/2024/07/25/harris-netanyahu-israel-cease-fire-00171315
If you're sitting on the October Surprise please share it. All the evidence we have suggests that Harris wants a ceasefire. While Trump wants a christo-fascist dictatorship and is content to watch Israel complete its genocide. The candidates have distinct positions despite your argument's attempt to conflate the two.