diff --git a/_toc.yml b/_toc.yml
index 80111ff5..ff0ed125 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -3,66 +3,68 @@
 #
 root: index
 format: jb-book
+defaults:
+  maxdepth: 2
 
 chapters:
-    - file: user-guide/index
-      sections:
-        - file: user-guide/login_servers
-        - file: user-guide/evolution_for_o365
-        - file: user-guide/thunderbird_for_o365
-        - file: user-guide/ssh_host_key_certificates
-        - file: user-guide/ssh_client_config
-        - file: user-guide/firefox_profile_per_host
-        - file: user-guide/kerberos_lifetime
-        - file: user-guide/putty
+  - file: user-guide/index
+    sections:
+      - file: user-guide/login_servers
+      - file: user-guide/evolution_for_o365
+      - file: user-guide/thunderbird_for_o365
+      - file: user-guide/ssh_host_key_certificates
+      - file: user-guide/ssh_client_config
+      - file: user-guide/firefox_profile_per_host
+      - file: user-guide/kerberos_lifetime
+      - file: user-guide/putty
 
-    - file: admin-guide/index
-      sections:
-        - file: admin-guide/architecture
-        - file: admin-guide/configuration
-          sections:
-            - file: admin-guide/configuration/vgroot
-            - file: admin-guide/configuration/citrix_vda
-        - file: admin-guide/guidelines
-        - file: admin-guide/deployment
-          sections:
-            - file: admin-guide/deployment/ipxe
-            - file: admin-guide/deployment/kickstart
-            - file: admin-guide/deployment/partitioning
-            - file: admin-guide/deployment/sample
-            - file: admin-guide/deployment/infrastructure
-            - file: admin-guide/deployment/workflow
-        - file: admin-guide/puppet
-        - file: admin-guide/selinux
-        - file: admin-guide/kerberos
-        - file: admin-guide/software
-        - file: admin-guide/mgmt-tools
-        - file: admin-guide/operations
-        - file: admin-guide/third-party
-        - file: admin-guide/troubleshooting
-        - file: admin-guide/more
+  - file: admin-guide/index
+    sections:
+      - file: admin-guide/architecture
+      - file: admin-guide/configuration
+        sections:
+          - file: admin-guide/configuration/vgroot
+          - file: admin-guide/configuration/citrix_vda
+      - file: admin-guide/guidelines
+      - file: admin-guide/deployment
+        sections:
+          - file: admin-guide/deployment/ipxe
+          - file: admin-guide/deployment/kickstart
+          - file: admin-guide/deployment/partitioning
+          - file: admin-guide/deployment/sample
+          - file: admin-guide/deployment/infrastructure
+          - file: admin-guide/deployment/workflow
+      - file: admin-guide/puppet
+      - file: admin-guide/selinux
+      - file: admin-guide/kerberos
+      - file: admin-guide/software
+      - file: admin-guide/mgmt-tools
+      - file: admin-guide/operations
+      - file: admin-guide/third-party
+      - file: admin-guide/troubleshooting
+      - file: admin-guide/more
 
-    - file: infrastructure-guide/index
-      sections:
-        - file: infrastructure-guide/infrastructure_systems
-          sections:
-            - file: infrastructure-guide/boot_server
-            - file: infrastructure-guide/sysdb_server
-            - file: infrastructure-guide/puppet01
-            - file: infrastructure-guide/repo_server
-            - file: infrastructure-guide/lxweb00
-            - file: infrastructure-guide/login
-            - file: infrastructure-guide/influx00
-            - file: infrastructure-guide/metrics00
-            - file: infrastructure-guide/lxsup00
-        - file: infrastructure-guide/infrastructure_administration
-        - file: infrastructure-guide/troubleshooting
+  - file: infrastructure-guide/index
+    sections:
+      - file: infrastructure-guide/infrastructure_systems
+        sections:
+          - file: infrastructure-guide/boot_server
+          - file: infrastructure-guide/sysdb_server
+          - file: infrastructure-guide/puppet01
+          - file: infrastructure-guide/repo_server
+          - file: infrastructure-guide/lxweb00
+          - file: infrastructure-guide/login
+          - file: infrastructure-guide/influx00
+          - file: infrastructure-guide/metrics00
+          - file: infrastructure-guide/lxsup00
+      - file: infrastructure-guide/infrastructure_administration
+      - file: infrastructure-guide/troubleshooting
 
-    - file: rhel8/index
-      sections:
-          - file: rhel8/installation
-          - file: rhel8/software
-          - file: rhel8/nvidia
-          - file: rhel8/kerberos
-          - file: rhel8/desktop
-          - file: rhel8/vendor_documentation
+  - file: rhel8/index
+    sections:
+      - file: rhel8/installation
+      - file: rhel8/software
+      - file: rhel8/nvidia
+      - file: rhel8/kerberos
+      - file: rhel8/desktop
+      - file: rhel8/vendor_documentation