# Operation Mode Parameters

URL: https://irs.systems/en/docs/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration/operationmodeparameters

You can change **operation mode parameter** values in the operation mode parameters section of the F10 dialog. There is a tab for each operation mode defined in your testplan.

> You need to load your [testplan](../../../TestStand/) before you can see and change operation mode parameters.

The operation mode parameters are [defined in your testplan](../../../teststand/operationmodes/), so you cannot add or remove parameters here. In this dialog you only change the current values of those operation mode parameters.

> You can update operation mode parameters even if if testplan is already running.

![Operation Mode Parameter Compare](/docs/assets/ltt/assets/ts-opmode-parameter-compare.png)

[go to initial setup guide](/en/docs/ltt/documentation/ltt-gui-manual/gettingstarted/initial-setup-guide#setup-guide)