FAQ: How Do I Force Registered Assets to Be Used in Early Retirement?
First, you'll want to check the RRSP/RRIF and LIRA/LIF conversion age in Planning > Projections > Advanced Options (top right of the planning table). Accounts like a LIRA or DCPP can only start withdrawals once converted to a LIF (which might be happening in your case if withdrawals only start at 72 currently).

Second, you can use the AI Strategies to test an RRSP Meltdown. These AI Strategies tell the platform to take more from the registered accounts and aim to maximize certain income thresholds. These can be found in the Planning > Projections > AI Strategies table. Rank by Area by clicking the Area header to group the RRSP Meltdown strategies together.

Finally, you can also add manual overrides in Planning > Projections > Table to the registered accounts. Go to the Table, scroll to the right to find your registered accounts, then open the accounts using the ">" arrow. You can manually add withdrawals by adding -ve overrides.