dosubot[bot] commented on issue #43713:
URL: https://github.com/apache/superset/issues/43713#issuecomment-5476256282

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   <!-- Answer -->
   Yes, changing the loading spinner in v6 is straightforward — it's a 
config-only change, no frontend rebuild required. A merged PR explicitly 
documents and tests this path 
[[1]](https://github.com/apache/superset/pull/36951).
   
   **How to do it:** Add `brandSpinnerUrl` to your `superset_config.py`:
   
   ```python
   THEME_DEFAULT = {
       "token": {
           "brandSpinnerUrl": "/static/assets/images/my-custom-spinner.svg",
       }
   }
   ```
   
   Place your SVG (or GIF) at the corresponding static path and restart 
Superset. The custom image will appear during loading 
[[1]](https://github.com/apache/superset/pull/36951).
   
   **Sizing caveat:** The frontend [Loading 
component](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/packages/superset-ui-core/src/components/Loading/index.tsx#L25-L48)
 renders the spinner as an `<img>` with `width: 50px` and `height: unset`. If 
your custom SVG doesn't have a roughly square aspect ratio or lacks a proper 
`viewBox`, it may appear stretched or oversized. Using a square canvas (e.g. 
`viewBox="0 0 64 64"`) avoids this.
   
   **Things to be aware of:**
   
   - In packaged/pip installs (without the frontend source tree), the backend 
previously tried to load the default spinner SVG from a path that doesn't 
exist, producing a harmless warning in logs. This was fixed and doesn't affect 
your custom `brandSpinnerUrl` 
[[2]](https://github.com/apache/superset/pull/40481).
   - There's an open PR that changes how `brandSpinnerSvg` (inline SVG content, 
distinct from `brandSpinnerUrl`) is rendered — switching from raw inline SVG to 
a base64 `<img>` data URI for security hardening 
[[3]](https://github.com/apache/superset/pull/43504). This doesn't change the 
visual behavior.
   
   **Example minimal SVG spinner** (square viewBox to scale cleanly):
   
   ```xml
   <svg width="64" height="64" viewBox="0 0 64 64" 
xmlns="http://www.w3.org/2000/svg";>
     <circle cx="32" cy="32" r="26" stroke="#2893B3" stroke-width="6" 
fill="none"
             stroke-linecap="round" stroke-dasharray="120 40">
       <animateTransform attributeName="transform" type="rotate"
                          from="0 32 32" to="360 32 32" dur="1s" 
repeatCount="indefinite"/>
     </circle>
   </svg>
   ```
   
   Save that as e.g. `/static/assets/images/my-spinner.svg` and point 
`brandSpinnerUrl` at it. If you'd like help debugging the sizing of a specific 
SVG you're already using, feel free to share its `<svg>` opening tag attributes.
   
   
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