diff --git a/src/nostalgia/modules/core/src/studio/tilesheeteditor-imgui.cpp b/src/nostalgia/modules/core/src/studio/tilesheeteditor-imgui.cpp
index 8a7d54d1..f1db8baa 100644
--- a/src/nostalgia/modules/core/src/studio/tilesheeteditor-imgui.cpp
+++ b/src/nostalgia/modules/core/src/studio/tilesheeteditor-imgui.cpp
@@ -123,6 +123,7 @@ void TileSheetEditorImGui::draw(turbine::Context*) noexcept {
 	ImGui::SameLine();
 	ImGui::BeginChild("Controls", ImVec2(m_palViewWidth - 8, paneSize.y), true);
 	{
+		const auto controlsSize = ImGui::GetContentRegionAvail();
 		ImGui::BeginChild("ToolBox", ImVec2(m_palViewWidth - 24, 30), true);
 		{
 			const auto btnSz = ImVec2(45, 14);
@@ -141,14 +142,14 @@ void TileSheetEditorImGui::draw(turbine::Context*) noexcept {
 			}
 		}
 		ImGui::EndChild();
-		const auto ySize = paneSize.y - 36;
+		const auto ySize = controlsSize.y - 38;
 		// draw palette/color picker
-		ImGui::BeginChild("Palette", ImVec2(m_palViewWidth - 24, ySize / 2.07f), true);
+		ImGui::BeginChild("Palette", ImVec2(m_palViewWidth - 24, ySize / 2.f), true);
 		{
 			drawPaletteSelector();
 		}
 		ImGui::EndChild();
-		ImGui::BeginChild("SubSheets", ImVec2(m_palViewWidth - 24, ySize / 2.03f), true);
+		ImGui::BeginChild("SubSheets", ImVec2(m_palViewWidth - 24, ySize / 2.f), true);
 		{
 			static constexpr auto btnHeight = 18;
 			const auto btnSize = ImVec2(18, btnHeight);