When you log into your apps or web version of your wallet, under the Security tab you can find “Limits”.
There you can set a limit per 24 hours, or per week. Please note that the limit includes both exchanging currencies within your wallet and sending currency to the other wallets. You can set the limits for each currency.
For example, let's say you set a limit of 100 DOGE for your wallet. It means that you won’t be allowed to withdraw more than one hundred DOGE per day. It's important that fee is not included, only the transfer amount. If you didn’t spend 100 DODE during the day, the remaining amount doesn’t get added up to the next day's limit. On the next day, the limit will still be 100 DOGE.
Once you set your withdrawal limit in the wallet, you will not be able to change it for 2 or 10 days, depending on whether you set a daily or a weekly limit. It is activated at the moment when you make your first transaction after setting the withdrawal limit.
This also applies in case you would want to deactivate the limit option. The limit will stay active for 2 more days and then it will be disabled.