This option is available for the Grid view only. To find it, go to:
Your portal's or shared view's Tables section
Click on the table you'd like to change the button for
Views section
Ensure that the View Type is set to Grid
Set the label under Custom title for open records button on the grid (Optional):
💡 Note: You can also use emojis here for a cleaner look! Here's a few examples that work well: 📝 🔍 ✍️