Custom PeekView CSS for VSCode which moves PeekView header actions to the left side.

peekview.css

.monaco-editor .peekview-widget .head {
  flex-direction: row-reverse;
}

.monaco-editor .peekview-widget .head .peekview-title {
  flex: 1;
}

.monaco-editor .peekview-widget .head .peekview-actions {
  flex: initial;
  margin-left: 20px;
}

.monaco-editor .peekview-widget .head .peekview-actions>.monaco-action-bar .action-item:first-child {
  order: 1;
}

.monaco-editor .peekview-widget .head .peekview-actions>.monaco-action-bar .action-item:first-child:not(:only-child) {
  margin-right: 16px;
}