Hi Nigel,
yes, it solves the problem. Thank you!
I have now changed this file: \ImageEn\Delphi10.1Berlin\Previews.dfm
(as I have Delphi10.1.2 Berlin):
object fPreviews: TfPreviews
Left = 327
Top = 311
BorderIcons = [biSystemMenu, biMaximize]
Caption = 'Previews'
Scaled = False
ClientHeight = 422
ClientWidth = 554
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = True
Position = poScreenCenter
OnActivate = FormActivate
OnCreate = FormCreate
OnDestroy = FormDestroy
OnResize = FormResize
PixelsPerInch = 96
TextHeight = 13
...