Yes, the proficiency level can be customized according to user preferences, as shown below.

The steps are as follows:

Step 1: From the Homepage navigate to the settings and click on settings.

Step 2: Click on the performance module, where you will find all the settings related to performance from their click on proficiency.

Step 3: In next step you need to set up the Proficiency Level, click on Create Proficiency:

Step 4: To create proficiency a window will appear where you can set the information and when you click on proficiency level you can customize the information according to it and then click on Save:

Step 5: The final window will appear with the saved Proficiencies: