highminded/ui/controls/SettingsUserControl.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="highminded.ui.controls.SettingsUserControl">

    <Grid Margin="15" RowSpacing="10" ColumnSpacing="10" RowDefinitions="Auto,Auto,Auto" ColumnDefinitions="*,*">
        
        <StackPanel Grid.Row="0" Grid.Column="0">
            <TextBlock Text="Model" />
            <TextBox Name="ModelTextBox" />
        </StackPanel>
        
        <StackPanel Grid.Row="0" Grid.Column="1">
            <TextBlock Text="API URL" />
            <TextBox Name="ApiUrlTextBox" />
        </StackPanel>
        
        <StackPanel Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2">
            <TextBlock Text="API Key" />
            <TextBox Name="ApiKeyTextBox" PasswordChar="*" />
        </StackPanel>
        
        <StackPanel Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2">
            <Button Name="SaveSettingsBtn" Content="Save" Click="SaveSettingsBtn_OnClick"/>
        </StackPanel> 
        
    </Grid>
</UserControl>