Environment variables stored as plain text

https://learn.microsoft.com/en-us/power-apps/maker/data-platform/environmentvariables

Manually create a secret environment variable in a solution

1. Sign in to Power Apps (make.powerapps.com), and then on the left pane select Solutions. If the item isn’t in the side panel pane, select … More and then select the item you want.
2. Open the solution you want or create a new one.
3. On the command bar, select New > More, and then select Environment variable.
4. On the right pane, complete the following columns, and then select Save:
   • Display name: Enter a name for the environment variable
   • Name: The unique name is automatically generated from the Display name, but you can change it.
   • Data type: set to Secret.
     • Additional information to set up and configure Azure Key Vault is needed to allow Power Platform to access the secret.

Do not use Text data type to store credentials or connection strings as these values could be read (and therefore leaked) by default users.