You do not specify what hint text for. I am guessing you are asking about B4XTable search hint text since you have another thread regarding B4XTable. If that is the case, then
Dim tf As Typeface
tf = tf.CreateNew(Typeface.DEFAULT_BOLD, Typeface.STYLE_ITALIC)
Dim fnt As B4XFont=xui.CreateFont(tf,30)
B4XTable1.SearchField.HintFont=fnt 'change hint text font
B4XTable1.SearchField.Update
Don't rush to ask questions. You need to give more details; otherwise people will be guessing as to the what the question is about.