dosubot[bot] commented on issue #43713: URL: https://github.com/apache/superset/issues/43713#issuecomment-5476083313
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The **loading spinner** (`brandSpinnerUrl`) is displayed while the app bootstraps and was introduced in [PR #34764](https://github.com/apache/superset/pull/34764). It supports two tokens: `brandSpinnerSvg` (inline SVG, takes precedence) and `brandSpinnerUrl` (image URL fallback) [[2]](https://github.com/apache/superset/pull/34764). The **navbar brand logo** is rendered afterward by `Menu.tsx` using `theme.brandLogoUrl`, `brandLogoHeight`, and `brandLogoMargin` — it has its own size constraints including `max-width` via `brandIconMaxWidth` and `img { height: 100%; object-fit: contain }` [[3]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/features/home/Menu.tsx#L60-L74) [[4]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/features/home/Menu.tsx#L267 -L289). What's most likely happening: your custom SVG referenced by `brandSpinnerUrl` doesn't have explicit `width`/`height` attributes or a `viewBox` with a defined aspect ratio, so the loading component renders it oversized. The Loading component defaults to `width: 50px; height: unset` [[5]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/packages/superset-ui-core/src/components/Loading/index.tsx#L25-L48), but an SVG without intrinsic dimensions can blow up with `height: unset`. **3. `APP_ICON_WIDTH` won't help here.** Since v6.0, logo customization is fully controlled via theme tokens (`brandLogoUrl`, `brandLogoHeight`, `brandLogoMargin`), and the legacy `APP_ICON`/`APP_ICON_WIDTH` keys are deprecated and no longer used by the React SPA navbar [[1]](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/documents/876a241f-01db-445e-a093-f65266ed16ff). `APP_ICON_WIDTH` only applies to the legacy Flask-AppBuilder [navbar.html template](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/templates/appbuilder/navbar.html#L20-L40). **To fix this:** - Ensure your SVG has explicit `width`/`height` attributes or a `viewBox` defining its intended dimensions — without these, the `height: unset` styling in the Loading component causes oversized rendering. - Make sure you're setting `brandSpinnerUrl` for the bootstrap loader and `brandLogoUrl` for the navbar logo — they are separate tokens. Don't use the same oversized SVG for both unless it's sized correctly for each context. - Use `THEME_DEFAULT` (not `THEMET`) for your config: ```python THEME_DEFAULT = { "token": { "brandSpinnerUrl": "/app/superset/static/assets/images/tvheryerde.svg", "brandLogoUrl": "/app/superset/static/assets/images/tvheryerde.svg", "brandLogoHeight": "24px", } } ``` If the oversized element only appears briefly during page load and then the navbar looks normal, that confirms it's the spinner. If it persists after the app finishes loading, the issue is with the navbar logo rendering — let me know which scenario you're seeing and I can dig deeper. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](<https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=apache%2Fsuperset>).* --- Share context across your team and agents. 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