At present, the SearchLookUpEdit does not provide the capability to change popup element appearance. However, you can resolve this task by getting the required controls from the SearchLookUpEdit's popup form and then setting the required appearance as follows:
Imports DevExpress.Utils.Win Imports DevExpress.XtraEditors Imports DevExpress.XtraLayout ... Private Sub searchLookUpEdit1_Popup(ByVal sender As Object, ByVal e As EventArgs) Dim lc As LayoutControl = TryCast((TryCast(sender, DevExpress.Utils.Win.IPopupControl)).PopupWindow.Controls(2).Controls(0), LayoutControl) TryCast(lc.Controls(6), SimpleButton).Appearance.Font = New Font("Arial", 12, FontStyle.Italic) TryCast(lc.Controls(7), TextEdit).Properties.Appearance.Font = New Font("Tahoma", 18) TryCast(lc.Controls(8), SimpleButton).Appearance.Font = New Font("Calibri", 24, FontStyle.Bold) End Sub
Additionally, you can use the approach described in the How to change the font of all DevExpress controls? ticket to specify a font for all DX controls.
Please try this and let me know your result.