To use your own Icon place the below code in your Site Header Code Injection and swap the SVG for your own.

<script>
  window.wmTooltipSettings = {
    customIcon: `<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="icon icon-tabler icons-tabler-outline icon-tabler-question-mark"></svg>`,
  };
</script>
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Showing An Image In A Tooltip