I'm using the latest version (1.1.5.4) of TAdvSearchCombobox, and found a display problem with 150% scaling. I have found a workaround: Change the font from Tahoma to Segoe UI.
It is easy to reproduce with the code below. The text is too large when first displayed. When I click it, it displays correctly.
I'm using Delphi 11.
If I use a standard TCombobox instead, there is no problem.
// Self.Font.Name := 'Tahoma';
// Self.Font.Size := 8;
Self.Font.Name := 'Segoe UI';
Self.Font.Size := 9;
var lCmb := TAdvSearchComboBox.Create(Self);
lCmb.Parent := Self;
lCmb.Items.Add('gdsfds');
lCmb.Items.Add('gdsfds');
lCmb.Items.Add('aaa');
lCmb.Items.Add('gdsfds');
lCmb.Items.Add('gdsfds');
lCmb.Text := 'aaa';