By default, the Expression Builder displays only non-internal libraries and functions. We can display all functions in the system in by overriding the pyShowInternalLibrary When rule setting.

1. In the Dev Studio Search field, enter pyShowInternalLibrary, and press Enter.

2. Open the When rule.

3. Click Save as, select Save As, and save the rule in your application ruleset.

4. On the Conditions tab, click false, click the Actions link, and select Edit.

5. In the Condition dialog box, enter True in the field, and click Submit.

6. Click Save.

Result:

All functions in the system appear in the leftmost panel of the Expression Builder.

I didn't found any difference by doing the above steps, can someone make understand. Please.

I feel personally writing expressions is really difficult, trying to learn.

https://community.pega.com/knowledgebase/articles/application-development/84/displaying-all-functions-expression-builder

***Edited by Moderator Marissa to update Platform Capability tags****