To begin removing fields from your client details, navigate to your lead type by going to:
Settings > LeadTypes
Then, open the LeadType
Select the field you want to change, and click Edit to open the lead field editor.
Select the Field Display Options Tab, then select your field and click Edit.
Next, scroll down and uncheck all items after Client Criteria:
Click OK on all screens, and save your lead type. This will now ensure all fields are removed from your clients lead details in the client portal view.