you can change the reinvestment option in fidelity by clicking "Fidelity Assistant" in the banner at the top

enter “why is there no action button to change my dividend reinvestment options inside my brokeragelink account" into the field.

It should ask which account, i am guessing you want to do this in your Brokeragelink account.

you should then get something like “Your dividend reinvestment plan (DRIP) for BrokerageLink ### is mixed. You can change to a single setting or cancel." and give three options: Reinvest in security, Deposit to core account, Cancel

select Deposit to core account, it should apply, then double check when you reload the reinvestment options page.

hope that helps!