You could review the Azure generated ARM template with your desired configuration
Scenario 1 - You're creating the AKS cluster
- At the Review + create section
- Click on Download a template for automation
- It will display the generated template given your specific configurations

Scenario 2 - You already created the AKS cluster
- Open the Resource Group where you deployed the AKS
- Click on Deployments
- Select your specific Deployment (A new tab will open, click on Template)

In conclusion, you could use the portal to either initiate or deploy the AKS with your desired configurations. Thereafter, just check out the generated ARM template for guidance.