I solved this by editing 2 css tags:
In slick-default-theme.css:
.slick-header-columns {
white-space: pre !important;
height: 45px;
}
heighthere is customizable according to your needs. It was good to display 3 lines.
In slick.grid.csschange the settings heightin the tag below to 100%:
.slick-header-column.ui-state-default {
...
height: 100%;
...
}
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