Multiple ISA Accounts/Providers or Just 1?

I am getting into investing and have deposited before the end of this tax year.

From next month, I wish to DCA from my salary monthly for both my medium-long term goals, but want a seperate pot for my retirement fund, which I will add to monthly a fixed amount and not touch for 25+ years.

I will mostly likely invest into an all world ETF for this. I will already be investing into an all word ETF as part of my main investing plan (medium-long term), but to help differentiate the pots, should I open a different ISA account with a different provider. I will be using T212 for my main account.

Or is there another recommended way to go about this? I just want it easier to differentiate my retirement pot at a glance, than it to all be in one account.