Edit: editor.min.css
.wp-block-group .block-editor-block-list__insertion-point{left:0;right:0}[data-type="core/group"].is-selected .block-list-appender{margin-left:0;margin-right:0}[data-type="core/group"].is-selected .has-background .block-list-appender{margin-bottom:18px;margin-top:18px}.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child{gap:inherit}.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child,.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child .block-editor-default-block-appender__content,.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child .block-editor-inserter{display:inherit;flex:1;flex-direction:inherit;width:100%}.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child:after{border:1px dashed;content:"";display:flex;flex:1 0 40px;min-height:38px;pointer-events:none}.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child{pointer-events:none}.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child .block-editor-button-block-appender,.wp-block-group.is-layout-flex.block-editor-block-list__block>.block-list-appender:only-child .block-editor-inserter{pointer-events:all}
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