You'd need to disable Cloud saves in-game (in Options), then do a manual save, then close the game, let Steam synchronize your saves. Then you'll be able to delete them.
The save folders are under "This PC > document > Baldur's Gate II - Enhanced edition". These are not synced to One drive. The cloud option I switched of and then switch back on later was the one within the BG II menu "Options > Game Play > Enable Cloud Saves"
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