In Power BI service you can manage the visual header, means you can show or hide the report visual header icons.
Whenever you hover the mouse on any report visual you will see some default visual header icons, see below screen shot for reference.

Visual Header on Power Bi Service
How to Manage Visual header on Power BI Service?
Step-1: Go to Reports Tab under Workspace > Click to Report Setting icon.

Report Settings 1
Step-2: Scroll down & Turned On Visual options (“Hide the visual header in reading view”). It will hide all report Visual header icons for selected report.

Report Settings
Step-3: To check, open the report & hover the mouse in any visual.

Visual Header Hide
And you can see in above screen shot visual header icons has been hide.
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