Change Tab's Size of TabPane in JavaFX

As far as I know the width and height of elements are read-only. You can set -fx-pref-width, -fx-pref-height, -fx-max-width, -fx-min-width, -fx-max-height, -fx-min-height ,-fx-border-width and -fx-border-height to adjust the size of Java FX elements.

You can do what you want by using Css:

.tab {

    -fx-pref-width: 250
} 
.tab-header-background {
    -fx-background-color:transparent
}

.tab-pane{
    -fx-padding: 0 -1 -1 -1
}

We can set minimum/maximum width/height for all Tabs on TabPane.

@FXML
TabPane tabPane;

and somewhere:

tabPane.setTabMinWidth(33);
tabPane.setTabMinHeight(33);
tabPane.setTabMaxWidth(69);
tabPane.setTabMaxHeight(69);