With the current version, the only way is to choose a server that you trust to be on the side of the fork you want. (disable auto-connect)
Right after the hard fork, we will be able to make a new release, that includes a checkpoint, because the block headers will differ.
Can you expand a bit? Will you offer two Electrum versions, one for each side of the split? Or one version with a configuration option? Or something else?
Also, will Electrum offer some protection from having a transaction, which is valid on both chains but was intended for one chain, to be accidentally picked up by the other?
I'm looking for a wallet to recommend to people, which will allow them to easily navigate through the fork mess, and hoping that Electrum is it...