Adjust assembly editor action layout and widths

Data/Server/WebUI/src/Assemblies/Assembly_Editor.jsx

@@ -629,12 +629,32 @@ export default function AssemblyEditor({
             </Typography>
           </Box>
 
-          <Box sx={{ display: "flex", alignItems: "center", gap: 2, mb: 0, flexWrap: "wrap" }}>
+          <Box
-            <Box sx={{ flex: 1 }}>
+            sx={{
+              display: "flex",
+              alignItems: "flex-start",
+              justifyContent: "space-between",
+              gap: 2,
+              mb: 0,
+              flexWrap: "wrap"
+            }}
+          >
+            <Box sx={{ flex: "1 1 auto", minWidth: 120 }}>
               <Typography variant="caption" sx={SECTION_TITLE_SX}>
                 Overview
               </Typography>
             </Box>
+            <Box
+              sx={{
+                display: "flex",
+                alignItems: "center",
+                gap: 1.5,
+                flexWrap: "wrap",
+                justifyContent: "flex-end",
+                ml: { xs: 0, sm: "auto" },
+                alignSelf: "flex-start"
+              }}
+            >
               {currentPath ? (
                 <Tooltip title="Rename File">
                   <Button
@@ -679,6 +699,7 @@ export default function AssemblyEditor({
                 {saving ? "Saving..." : "Save Assembly"}
               </Button>
             </Box>
+          </Box>
 
           <Grid container spacing={2}>
             <Grid item xs={12} md={6}>
@@ -792,7 +813,10 @@ export default function AssemblyEditor({
                   label="Site Scope"
                   value={siteScopeValue}
                   onChange={(e) => updateSitesMode(e.target.value)}
-                  sx={{ ...SELECT_BASE_SX, flex: 1 }}
+                  sx={{
+                    ...SELECT_BASE_SX,
+                    width: { xs: "100%", sm: 320, lg: 360 }
+                  }}
                   SelectProps={{ MenuProps: MENU_PROPS }}
                 >
                   <MenuItem value="all">All Sites</MenuItem>
@@ -805,7 +829,10 @@ export default function AssemblyEditor({
                     label="Allowed Sites"
                     value={selectedSiteValues}
                     onChange={(e) => updateSelectedSites(Array.isArray(e.target.value) ? e.target.value : [])}
-                    sx={{ ...SELECT_BASE_SX, flex: 1 }}
+                    sx={{
+                      ...SELECT_BASE_SX,
+                      width: { xs: "100%", sm: 360, lg: 420 }
+                    }}
                     SelectProps={{
                       multiple: true,
                       renderValue: (selected) => {