How to remove the arrow in dropdown in Bootstrap 4?

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Simply remove “dropdown-toggle” class from the element. The dropdown will still work if you have the data-toggle attribute as follows

<button role="button" type="button" class="btn" data-toggle="dropdown"> 
    Dropdown Without Arrow
</button>

overriding .dropdown-toggle class styles affects all dropdowns and you may want to keep the arrow in other buttons, that’s why this looks to me the simplest solution.

Edit: Keep dropdown class if you want to keep border styling

<button role="button" type="button" class="btn dropdown" data-toggle="dropdown"> 
    Dropdown Without Arrow
</button>

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