I mod of the discord gave me this snippet, this was an intentional change but it’s fixable by a custom theme:
.workspace-leaf,
.workspace-tab-header-container {
background: transparent;
}
.workspace-split.mod-root,
.workspace-split.mod-root .view-content,
.workspace-split.mod-root .view-header {
background: transparent;
}
.view-header-title-container:not(.mod-at-end):after {
background: transparent;
}