diff --git a/index.css b/index.css
index 4d6f7f15..db8ccb89 100644
--- a/index.css
+++ b/index.css
@@ -1227,7 +1227,7 @@ i.resetButton:active {
 }
 
 .ui-dialog input[type="number"] {
-  width: 3.5em;
+  width: 4.5em;
 }
 
 .ui-dialog .disabled {
diff --git a/modules/markers-generator.js b/modules/markers-generator.js
index 4f2376d1..ed902be6 100644
--- a/modules/markers-generator.js
+++ b/modules/markers-generator.js
@@ -28,7 +28,7 @@ window.Markers = (function () {
       {type: "pirates", icon: "🏴‍☠️", multiplier: 1, fn: addPirates},
       {type: "statues", icon: "🗿", multiplier: 1, fn: addStatues},
       {type: "ruines", icon: "🏺", multiplier: 1, fn: addRuines},
-      {type: "portals", icon: "🌀", multiplier: isFantasy, fn: addPortals}
+      {type: "portals", icon: "🌀", multiplier: +isFantasy, fn: addPortals}
     ];
   }
 
diff --git a/modules/ui/tools.js b/modules/ui/tools.js
index 1e9359a2..8574be29 100644
--- a/modules/ui/tools.js
+++ b/modules/ui/tools.js
@@ -6,7 +6,7 @@ toolsContent.addEventListener("click", function (event) {
     tip("Please exit the customization mode first", false, "warning");
     return;
   }
-  if (event.target.tagName !== "BUTTON") return;
+  if (!["BUTTON", "I"].includes(event.target.tagName)) return;
   const button = event.target.id;
 
   // click on open Editor buttons
@@ -64,6 +64,80 @@ toolsContent.addEventListener("click", function (event) {
 
   // click on Configure regenerate buttons
   if (button === "configRegenerateMarkers") {
+    const {markers} = pack;
+    const config = Markers.getConfig();
+
+    const headers = `<thead style='font-weight:bold'><tr>
+      <td data-tip="Marker type name">Type</td>
+      <td data-tip="Marker icon">Icon</td>
+      <td data-tip="Marker number multiplier">Multiplier</td>
+      <td data-tip="Number of markers of that type on the current map">Number</td>
+    </tr></thead>`;
+    const lines = config.map(({type, icon, multiplier}, index) => {
+      const inputId = `markerIconInput${index}`;
+      return `<tr>
+        <td><input value="${type}" /></td>
+        <td>
+          <input id="${inputId}" style="width: 5em" value="${icon}" />
+          <i class="icon-edit pointer" style="position: absolute; margin:.4em 0 0 -1.4em; font-size:.85em"></i>
+        </td>
+        <td><input type="number" min="0" max="100" step="0.1" value="${multiplier}" /></td>
+        <td style="text-align:center">${markers.filter(marker => marker.type === type).length}</td>
+      </tr>`;
+    });
+    const table = `<table class="table">${headers}<tbody>${lines.join("")}</tbody></table>`;
+    alertMessage.innerHTML = table;
+
+    alertMessage.querySelectorAll("i").forEach(selectIconButton => {
+      selectIconButton.addEventListener("click", function () {
+        const input = this.previousElementSibling;
+        selectIcon(input.value, icon => (input.value = icon));
+      });
+    });
+
+    const applyChanges = () => {
+      const rows = alertMessage.querySelectorAll("tbody > tr");
+      const rowsData = Array.from(rows).map(row => {
+        const inputs = row.querySelectorAll("input");
+        return {
+          type: inputs[0].value,
+          icon: inputs[1].value,
+          multiplier: parseFloat(inputs[2].value)
+        };
+      });
+
+      const newConfig = config.map((markerType, index) => {
+        const {type, icon, multiplier} = rowsData[index];
+        return {...markerType, type, icon, multiplier};
+      });
+      Markers.setConfig(newConfig);
+
+      Markers.regenerate();
+      turnButtonOn("toggleMarkers");
+      drawMarkers();
+
+      $("#alert").dialog("close");
+    };
+
+    $("#alert").dialog({
+      resizable: false,
+      title: "Markers generation settings",
+      position: {my: "left top", at: "left+10 top+10", of: "svg", collision: "fit"},
+      buttons: {
+        Apply: applyChanges,
+        Cancel: function () {
+          $(this).dialog("close");
+        }
+      },
+      open: function () {
+        const buttons = $(this).dialog("widget").find(".ui-dialog-buttonset > button");
+        buttons[0].addEventListener("mousemove", () => tip("Apply changes and regenerate markers"));
+        buttons[1].addEventListener("mousemove", () => tip("Cancel changes"));
+      },
+      close: function () {
+        $(this).dialog("destroy");
+      }
+    });
   }
 
   // click on Add buttons
diff --git a/modules/ui/world-configurator.js b/modules/ui/world-configurator.js
index aa83eb82..22dccacb 100644
--- a/modules/ui/world-configurator.js
+++ b/modules/ui/world-configurator.js
@@ -18,6 +18,9 @@ function editWorld() {
       buttons[2].addEventListener("mousemove", () => tip("Click to set map size to cover the Tropical latitudes"));
       buttons[3].addEventListener("mousemove", () => tip("Click to set map size to cover the Southern latitudes"));
       buttons[4].addEventListener("mousemove", () => tip("Click to restore default wind directions"));
+    },
+    close: function () {
+      $(this).dialog("destroy");
     }
   });