ComboBox

Flow
1

If possible change to Combobox height in css @CssImport(value = “./styles/vaadin-combo-box-styles.css”, themeFor = “vaadin-combo-box”)

vaadin-combo-box-styles.css
[part=“input-field”] {
color:red;
height:10px! important;
}
Not work any idea

2 
vaadin-combo-box {
  --lumo-text-field-size: 50px;
}```

Although it won't shrink as small as 10px unless you also make some other tweaks.
3

Perhaps you’d be interested in the Compact preset for Lumo? https://vaadin.com/docs/latest/styling/lumo/variants/compact