You can set spending limits by clicking into the wallet you’d like to set them for, and selecting “Policy” from the middle navigation bar. On the left, under “Policy”, you’ll see “Daily Limits” and “Transaction Limits”, and you can set those amounts in Bitcoin. The above only applies to V1 wallets. 

V2 coins: In the Policy tab, you will see "Spending Limits" where you could enable spending limits per transaction, per hour and per day. Transactions over a specified limit require admin approval.