Why Vertical Tabs Snap Back to Horizontal After Profile Switch in Edge

Quick fix: Edge stores the Vertical Tabs preference per profile in Local State, but profile switches sometimes load before the preference is read. Force a default by setting VerticalTabs via policy: registry HKLM\Software\Policies\Microsoft\Edge\VerticalTabsAllowedDefault = 1, or open Edge to edge://settings/appearance and re-toggle Vertical Tabs after a switch.

You use Vertical Tabs in Edge because you have a wide monitor and 30 tabs open. You switch from your work profile to your personal one, and the new profile loads with horizontal tabs. You toggle vertical again, work for ten minutes, switch back to work, switch to personal — horizontal again. The setting is per-profile but the per-profile cache isn’t loading reliably.

Where Vertical Tabs state is stored

Vertical Tabs has two state layers: a per-profile preference in %LocalAppData%\Microsoft\Edge\User Data\Profile X\Preferences (under tab_layout) and a window-state in Local State at the root of User Data. When you switch profiles, Edge closes the current window and opens a new one in the target profile. The new window reads Local State first (window position, size), then the profile’s preference file. If the profile preference is stale, Edge uses the window default, which is horizontal.

The race condition appears more on Edge Canary/Dev/Beta than on stable Edge, but it does happen on stable when profiles are switched rapidly or when sync is mid-update.

Method 1: Re-set Vertical Tabs as default for both profiles

1. Open Edge with your work profile.
2. Navigate to edge://settings/appearance.
3. Toggle Show vertical tabs by default off, then on. This forces a fresh write to the profile preferences.
4. Close Edge completely (X all windows; confirm edge.exe isn’t in Task Manager).
5. Open Edge with the personal profile. Repeat steps 2–3.
6. Close Edge, reopen, and switch profiles. Verticals should stick now.

The re-toggle writes a fresh timestamp to the preference, which Edge prefers over the stale one. Subsequent profile switches use the new value.

Method 2: Force Vertical Tabs via policy

For chronic profile-switch issues, set a machine-wide policy that defaults all profiles to vertical:

1. Press Win + R, type regedit, press Enter.
2. Navigate to HKLM\Software\Policies\Microsoft\Edge. Create the key if missing.
3. Create a DWORD named VerticalTabsAllowedDefault and set value to 1 (enabled by default; users can still toggle).
4. Or for a forced-on policy that users can’t change, also create VerticalTabsForced = 1.
5. Restart Edge fully. The setting applies on next launch.

For Pro/Enterprise users, the same policy is in Group Policy under Microsoft Edge → Configure vertical tabs.

Method 3: Use separate Edge windows per profile

For users who switch profiles frequently and the toggle issue is too disruptive, run both profiles in separate windows side-by-side rather than switching.

1. In Edge, click your profile icon (top-right).
2. Click your other profile’s entry while holding Ctrl. A new window opens in that profile.
3. Each window has its own profile state, including Vertical Tabs preference.
4. Pin both Edge windows to specific virtual desktops (Win+Ctrl+D, drag the Edge window to one desktop, etc.) for quick switching without closing windows.

Two windows = no profile switching = no race condition. The trade-off is RAM usage for the extra Edge process.

How to verify the fix worked

• Switch from work to personal profile. New window opens with Vertical Tabs on.
• Switch back to work. Still Vertical Tabs.
• Restart Edge and switch profiles within seconds of opening. Vertical Tabs persists.
• Open edge://policy. The VerticalTabs policy values appear under Cloud or Platform source.

If none of these work

If Vertical Tabs still flips on profile switch, the profile’s Preferences file may be corrupted. Close Edge, navigate to %LocalAppData%\Microsoft\Edge\User Data\Profile X, rename Preferences to Preferences.bak, reopen Edge. Edge creates a fresh Preferences file; re-set your Vertical Tabs preference and other personalization. For users on Edge Beta/Dev/Canary channels, this issue is more common — consider switching to Stable for daily use and using Canary for testing only. For managed devices, an Intune-pushed policy may be overriding local settings — check Edge’s policy page to confirm.

Bottom line: Vertical Tabs flipping on profile switch is a known Edge race condition. Re-toggling forces a fresh write; the registry/GPO policy locks the default for all profiles; separate windows avoid the issue entirely. Pick the depth that matches your workflow.