Implemented the FullWidthModifier modifier in the UI library, and implemented the "fullWidth(alignment: )" function for its View+Modifiers extension.

Libraries/UI/Kit/Sources/Extensions/View+Modifiers.swift

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+//
+//  View+Modifiers.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 19/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import SwiftUI
+
+extension View {
+    
+    // MARK: Functions
+    public func fullWidth(alignment: Alignment = .leading) -> some View {
+        modifier(FullWidthModifier(alignment: alignment))
+    }
+    
+}

Libraries/UI/Kit/Sources/Modifiers/FullWidthModifier.swift

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+//
+//  FullWidthModifier.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 19/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import SwiftUI
+
+struct FullWidthModifier: ViewModifier {
+    
+    // MARK: Constants
+    private let alignment: Alignment
+    
+    // MARK: Initialisers
+    init(alignment: Alignment) {
+        self.alignment = alignment
+    }
+    
+    // MARK: Functions
+    func body(content: Content) -> some View {
+        content
+            .frame(
+                maxWidth: .infinity,
+                alignment: alignment
+            )
+    }
+    
+}
+
+// MARK: - Previews
+#Preview {
+    Group {
+        Text("Hello, world!")
+            .modifier(FullWidthModifier(alignment: .leading))
+        Text("Hello, world!")
+            .modifier(FullWidthModifier(alignment: .center))
+        Text("Hello, world!")
+            .modifier(FullWidthModifier(alignment: .trailing))
+    }
+    .padding(.horizontal)
+}