That the tooltip arrow is enabled by default.

The tooltip arrow is disabled by default, and the DOC contains no information other than the tooltip arrow's width and height:

$tooltip-arrow-width and $tooltip-arrow-height

Which do not enable the arrow.

Actual code scss:

$tooltip-bg: #000;

$tooltip-arrow-width:  0.8rem !important;

$tooltip-arrow-height: 0.4rem !important;

$tooltip-border-color: #be0505;

$tooltip-border-radius: 0.75rem !important;

$tooltip-padding-x:    3px;

@import 'mdb-angular-ui-kit/assets/scss/mdb.scss';