Key Takeaways
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Investing needs a Standard or Pro plan. See Plans and billing.
Open the fund's action menu, the three dots next to Invest more, and choose Withdraw. Enter how much to sell. If the amount would close positions entirely, a red Heads up notice says so. Preview and submit as above. Proceeds settle as cash in two business days, then leave through Alpaca.
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Over time some holdings grow faster than others and drift from their target weights. Rebalance in the action menu sells the overweight ones and buys the underweight ones to restore the targets. A confirmation asks Rebalance to place trades? before the preview. If nothing has drifted, the preview says no orders are needed.

Funds with Auto-rebalance on changes enabled in Expert mode do this on their own whenever the source fund updates.
Recurring buy in the action menu sets an amount, a start date, and how often. Each run appears under Scheduled Orders and executes at the market open on its day. The same dialog cancels it later.

Preview keeps loading. Alpaca's price feed can be slow just after the open. Close and try again in a minute.
"Custom funds require Pro". Investing in a custom fund is a Pro feature. Filtered funds work on every plan.
The withdraw amount is capped below the fund value. The cap is the current market value minus the $0.01 per-order buffer. Use the full withdrawal from the menu to close a fund completely.